1. 8.5.x core/includes/form.inc
  2. 8.0.x core/includes/form.inc
  3. 8.1.x core/includes/form.inc
  4. 8.2.x core/includes/form.inc
  5. 8.3.x core/includes/form.inc
  6. 8.4.x core/includes/form.inc
  7. 8.6.x core/includes/form.inc
  8. 4.7.x includes/form.inc
  9. 5.x includes/form.inc
  10. 6.x includes/form.inc
  11. 7.x includes/form.inc

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includes/form.inc
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<?php

/**
 * @defgroup form Form generation
 * @{
 * Functions to enable the processing and display of HTML forms.
 *
 * Drupal uses these functions to achieve consistency in its form processing and
 * presentation, while simplifying code and reducing the amount of HTML that
 * must be explicitly generated by modules.
 *
 * The drupal_get_form() function handles retrieving, processing, and
 * displaying a rendered HTML form for modules automatically. For example:
 *
 * @code
 * // Display the user registration form.
 * $output = drupal_get_form('user_register');
 * @endcode
 *
 * Forms can also be built and submitted programmatically without any user input
 * using the drupal_execute() function.
 *
 * For information on the format of the structured arrays used to define forms,
 * and more detailed explanations of the Form API workflow, see the
 * @link http://api.drupal.org/api/file/developer/topics/forms_api_reference.html/5 reference @endlink
 * and the @link http://api.drupal.org/api/file/developer/topics/forms_api.html/5 quickstart guide. @endlink
 */

/**
 * Retrieves a form from a builder function, passes it on for
 * processing, and renders the form or redirects to its destination
 * as appropriate. In multi-step form scenarios, it handles properly
 * processing the values using the previous step's form definition,
 * then rendering the requested step for display.
 *
 * @param $form_id
 *   The unique string identifying the desired form. If a function
 *   with that name exists, it is called to build the form array.
 *   Modules that need to generate the same form (or very similar forms)
 *   using different $form_ids can implement hook_forms(), which maps
 *   different $form_id values to the proper form building function. Examples
 *   may be found in node_forms(), search_forms(), and user_forms().
 * @param ...
 *   Any additional arguments needed by the form building function.
 * @return
 *   The rendered form.
 */
function drupal_get_form($form_id) {

  // In multi-step form scenarios, the incoming $_POST values are not
  // necessarily intended for the current form. We need to build
  // a copy of the previously built form for validation and processing,
  // then go on to the one that was requested if everything works.
  $form_build_id = md5(mt_rand());
  if (isset($_POST['form_build_id']) && isset($_SESSION['form'][$_POST['form_build_id']]['args']) && $_POST['form_id'] == $form_id) {

    // There's a previously stored multi-step form. We should handle
    // IT first.
    $stored = TRUE;
    $args = $_SESSION['form'][$_POST['form_build_id']]['args'];
    $form = call_user_func_array('drupal_retrieve_form', $args);
    $form['#build_id'] = $_POST['form_build_id'];
  }
  else {

    // We're coming in fresh; build things as they would be. If the
    // form's #multistep flag is set, store the build parameters so
    // the same form can be reconstituted for validation.
    $args = func_get_args();
    $form = call_user_func_array('drupal_retrieve_form', $args);
    if (isset($form['#multistep']) && $form['#multistep']) {

      // Clean up old multistep form session data.
      _drupal_clean_form_sessions();
      $_SESSION['form'][$form_build_id] = array(
        'timestamp' => time(),
        'args' => $args,
      );
      $form['#build_id'] = $form_build_id;
    }
    $stored = FALSE;
  }

  // Process the form, submit it, and store any errors if necessary.
  drupal_process_form($args[0], $form);
  if ($stored && !form_get_errors()) {

    // If it's a stored form and there were no errors, we processed the
    // stored form successfully. Now we need to build the form that was
    // actually requested. We always pass in the current $_POST values
    // to the builder function, as values from one stage of a multistep
    // form can determine how subsequent steps are displayed.
    $args = func_get_args();
    $args[] = $_POST;
    $form = call_user_func_array('drupal_retrieve_form', $args);
    unset($_SESSION['form'][$_POST['form_build_id']]);
    if (isset($form['#multistep']) && $form['#multistep']) {
      $_SESSION['form'][$form_build_id] = array(
        'timestamp' => time(),
        'args' => $args,
      );
      $form['#build_id'] = $form_build_id;
    }
    drupal_prepare_form($args[0], $form);
  }
  return drupal_render_form($args[0], $form);
}

/**
 * Remove form information that's at least a day old from the
 * $_SESSION['form'] array.
 */
function _drupal_clean_form_sessions() {
  if (isset($_SESSION['form'])) {
    foreach ($_SESSION['form'] as $build_id => $data) {
      if ($data['timestamp'] < time() - 84600) {
        unset($_SESSION['form'][$build_id]);
      }
    }
  }
}

/**
 * Retrieves a form using a form_id, populates it with $form_values,
 * processes it, and returns any validation errors encountered. This
 * function is the programmatic counterpart to drupal_get_form().
 *
 * @param $form_id
 *   The unique string identifying the desired form. If a function
 *   with that name exists, it is called to build the form array.
 *   Modules that need to generate the same form (or very similar forms)
 *   using different $form_ids can implement hook_forms(), which maps
 *   different $form_id values to the proper form building function. Examples
 *   may be found in node_forms(), search_forms(), and user_forms().
 * @param $form_values
 *   An array of values mirroring the values returned by a given form
 *   when it is submitted by a user.
 * @param ...
 *   Any additional arguments needed by the form building function.
 * @return
 *   Any form validation errors encountered.
 *
 * For example:
 *
 * // register a new user
 * $values['name'] = 'robo-user';
 * $values['mail'] = 'robouser@example.com';
 * $values['pass'] = 'password';
 * drupal_execute('user_register', $values);
 *
 * // Create a new node
 * $node = array('type' => 'story');
 * $values['title'] = 'My node';
 * $values['body'] = 'This is the body text!';
 * $values['name'] = 'robo-user';
 * drupal_execute('story_node_form', $values, $node);
 */
function drupal_execute($form_id, $form_values) {
  $args = func_get_args();
  $form_id = array_shift($args);
  $form_values = array_shift($args);
  array_unshift($args, $form_id);
  if (isset($form_values)) {
    $form = call_user_func_array('drupal_retrieve_form', $args);
    $form['#post'] = $form_values;
    return drupal_process_form($form_id, $form);
  }
}

/**
 * Retrieves the structured array that defines a given form.
 *
 * @param $form_id
 *   The unique string identifying the desired form. If a function
 *   with that name exists, it is called to build the form array.
 *   Modules that need to generate the same form (or very similar forms)
 *   using different $form_ids can implement hook_forms(), which maps
 *   different $form_id values to the proper form building function.
 * @param ...
 *   Any additional arguments needed by the form building function.
 */
function drupal_retrieve_form($form_id) {
  static $forms;

  // We save two copies of the incoming arguments: one for modules to use
  // when mapping form ids to builder functions, and another to pass to
  // the builder function itself. We shift out the first argument -- the
  // $form_id itself -- from the list to pass into the builder function,
  // since it's already known.
  $args = func_get_args();
  $saved_args = $args;
  array_shift($args);

  // We first check to see if there's a function named after the $form_id.
  // If there is, we simply pass the arguments on to it to get the form.
  if (!function_exists($form_id)) {

    // In cases where many form_ids need to share a central builder function,
    // such as the node editing form, modules can implement hook_forms(). It
    // maps one or more form_ids to the correct builder functions.
    //
    // We cache the results of that hook to save time, but that only works
    // for modules that know all their form_ids in advance. (A module that
    // adds a small 'rate this comment' form to each comment in a list
    // would need a unique form_id for each one, for example.)
    //
    // So, we call the hook if $forms isn't yet populated, OR if it doesn't
    // yet have an entry for the requested form_id.
    if (!isset($forms) || !isset($forms[$form_id])) {
      $forms = module_invoke_all('forms', $saved_args);
    }
    $form_definition = $forms[$form_id];
    if (isset($form_definition['callback arguments'])) {
      $args = array_merge($form_definition['callback arguments'], $args);
    }
    if (isset($form_definition['callback'])) {
      $callback = $form_definition['callback'];
    }
  }

  // If $callback was returned by a hook_forms() implementation, call it.
  // Otherwise, call the function named after the form id.
  $form = call_user_func_array(isset($callback) ? $callback : $form_id, $args);

  // We store the original function arguments, rather than the final $arg
  // value, so that form_alter functions can see what was originally
  // passed to drupal_retrieve_form(). This allows the contents of #parameters
  // to be saved and passed in at a later date to recreate the form.
  $form['#parameters'] = $saved_args;
  return $form;
}

/**
 * This function is the heart of form API. The form gets built, validated and in
 * appropriate cases, submitted.
 *
 * @param $form_id
 *   The unique string identifying the current form.
 * @param $form
 *   An associative array containing the structure of the form.
 * @return
 *   The path to redirect the user to upon completion.
 */
function drupal_process_form($form_id, &$form) {
  global $form_values, $form_submitted, $user, $form_button_counter;
  static $saved_globals = array();

  // In some scenarios, this function can be called recursively. Pushing any pre-existing
  // $form_values and form submission data lets us start fresh without clobbering work done
  // in earlier recursive calls.
  array_push($saved_globals, array(
    $form_values,
    $form_submitted,
    $form_button_counter,
  ));
  $form_values = array();
  $form_submitted = FALSE;
  $form_button_counter = array(
    0,
    0,
  );
  drupal_prepare_form($form_id, $form);
  if ($form['#programmed'] || !empty($_POST) && $_POST['form_id'] == $form_id) {
    drupal_validate_form($form_id, $form);

    // IE does not send a button value when there is only one submit button (and no non-submit buttons)
    // and you submit by pressing enter.
    // In that case we accept a submission without button values.
    if (($form['#programmed'] || $form_submitted || !$form_button_counter[0] && $form_button_counter[1]) && !form_get_errors()) {
      $redirect = drupal_submit_form($form_id, $form);
      if (!$form['#programmed']) {
        drupal_redirect_form($form, $redirect);
      }
    }
  }

  // We've finished calling functions that alter the global values, so we can
  // restore the ones that were there before this function was called.
  list($form_values, $form_submitted, $form_button_counter) = array_pop($saved_globals);
  return $redirect;
}

/**
 * Prepares a structured form array by adding required elements,
 * executing any hook_form_alter functions, and optionally inserting
 * a validation token to prevent tampering.
 *
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 * @param $form
 *   An associative array containing the structure of the form.
 */
function drupal_prepare_form($form_id, &$form) {
  global $user;
  $form['#type'] = 'form';
  if (!isset($form['#post'])) {
    $form['#post'] = $_POST;
    $form['#programmed'] = FALSE;
  }
  else {
    $form['#programmed'] = TRUE;
  }

  // In multi-step form scenarios, this id is used to identify
  // a unique instance of a particular form for retrieval.
  if (isset($form['#build_id'])) {
    $form['form_build_id'] = array(
      '#type' => 'hidden',
      '#value' => $form['#build_id'],
      '#id' => $form['#build_id'],
      '#name' => 'form_build_id',
    );
  }

  // If $base is set, it is used in place of $form_id when constructing validation,
  // submission, and theming functions. Useful for mapping many similar or duplicate
  // forms with different $form_ids to the same processing functions.
  if (isset($form['#base'])) {
    $base = $form['#base'];
  }

  // Add a token, based on either #token or form_id, to any form displayed to
  // authenticated users. This ensures that any submitted form was actually
  // requested previously by the user and protects against cross site request
  // forgeries.
  if (isset($form['#token'])) {
    if ($form['#token'] === FALSE || $user->uid == 0 || $form['#programmed']) {
      unset($form['#token']);
    }
    else {
      $form['form_token'] = array(
        '#type' => 'token',
        '#default_value' => drupal_get_token($form['#token']),
      );
    }
  }
  else {
    if ($user->uid && !$form['#programmed']) {
      $form['#token'] = $form_id;
      $form['form_token'] = array(
        '#id' => form_clean_id('edit-' . $form_id . '-form-token'),
        '#type' => 'token',
        '#default_value' => drupal_get_token($form['#token']),
      );
    }
  }
  if (isset($form_id)) {
    $form['form_id'] = array(
      '#type' => 'hidden',
      '#value' => $form_id,
      '#id' => form_clean_id("edit-{$form_id}"),
    );
  }
  if (!isset($form['#id'])) {
    $form['#id'] = form_clean_id($form_id);
  }
  $form += _element_info('form');
  if (!isset($form['#validate'])) {
    if (function_exists($form_id . '_validate')) {
      $form['#validate'] = array(
        $form_id . '_validate' => array(),
      );
    }
    elseif (function_exists($base . '_validate')) {
      $form['#validate'] = array(
        $base . '_validate' => array(),
      );
    }
  }
  if (!isset($form['#submit'])) {
    if (function_exists($form_id . '_submit')) {

      // We set submit here so that it can be altered.
      $form['#submit'] = array(
        $form_id . '_submit' => array(),
      );
    }
    elseif (function_exists($base . '_submit')) {
      $form['#submit'] = array(
        $base . '_submit' => array(),
      );
    }
  }
  foreach (module_implements('form_alter') as $module) {
    $function = $module . '_form_alter';
    $function($form_id, $form);
  }
  $form = form_builder($form_id, $form);
}

/**
 * Validates user-submitted form data from a global variable using
 * the validate functions defined in a structured form array.
 *
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 * @param $form
 *   An associative array containing the structure of the form.
 *
 */
function drupal_validate_form($form_id, $form) {
  global $form_values;
  static $validated_forms = array();
  if (isset($validated_forms[$form_id])) {
    return;
  }

  // If the session token was set by drupal_prepare_form(), ensure that it
  // matches the current user's session.
  if (isset($form['#token'])) {
    if (!drupal_valid_token($form_values['form_token'], $form['#token'])) {

      // Setting this error will cause the form to fail validation.
      form_set_error('form_token', t('Validation error, please try again. If this error persists, please contact the site administrator.'));
    }
  }
  _form_validate($form, $form_id);
  $validated_forms[$form_id] = TRUE;
}

/**
 * Processes user-submitted form data from a global variable using
 * the submit functions defined in a structured form array.
 *
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 * @param $form
 *   An associative array containing the structure of the form.
 * @return
 *   A string containing the path of the page to display when processing
 *   is complete.
 *
 */
function drupal_submit_form($form_id, $form) {
  global $form_values;
  $default_args = array(
    $form_id,
    &$form_values,
  );
  $submitted = FALSE;
  $goto = NULL;
  if (isset($form['#submit'])) {
    foreach ($form['#submit'] as $function => $args) {
      if (function_exists($function)) {
        $args = array_merge($default_args, (array) $args);

        // Since we can only redirect to one page, only the last redirect
        // will work.
        $redirect = call_user_func_array($function, $args);
        $submitted = TRUE;
        if (isset($redirect)) {
          $goto = $redirect;
        }
      }
    }
  }
  return $goto;
}

/**
 * Renders a structured form array into themed HTML.
 *
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 * @param $form
 *   An associative array containing the structure of the form.
 * @return
 *   A string containing the path of the page to display when processing
 *   is complete.
 *
 */
function drupal_render_form($form_id, &$form) {

  // Don't override #theme if someone already set it.
  if (isset($form['#base'])) {
    $base = $form['#base'];
  }
  if (!isset($form['#theme'])) {
    if (theme_get_function($form_id)) {
      $form['#theme'] = $form_id;
    }
    elseif (theme_get_function($base)) {
      $form['#theme'] = $base;
    }
  }
  if (isset($form['#pre_render'])) {
    foreach ($form['#pre_render'] as $function) {
      if (function_exists($function)) {
        $function($form_id, $form);
      }
    }
  }
  $output = drupal_render($form);
  return $output;
}

/**
 * Redirect the user to a URL after a form has been processed.
 *
 * @param $form
 *   An associative array containing the structure of the form.
 * @param $redirect
 *   An optional string containing the destination path to redirect
 *   to if none is specified by the form.
 *
 */
function drupal_redirect_form($form, $redirect = NULL) {
  if (isset($redirect)) {
    $goto = $redirect;
  }
  if (isset($form['#redirect'])) {
    $goto = $form['#redirect'];
  }
  if ($goto !== FALSE) {
    if (is_array($goto)) {
      call_user_func_array('drupal_goto', $goto);
    }
    elseif (!isset($goto)) {
      drupal_goto($_GET['q']);
    }
    else {
      drupal_goto($goto);
    }
  }
}

/**
 * Performs validation on form elements. First ensures required fields are
 * completed, #maxlength is not exceeded, and selected options were in the
 * list of options given to the user. Then calls user-defined validators.
 *
 * @param $elements
 *   An associative array containing the structure of the form.
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 */
function _form_validate($elements, $form_id = NULL) {

  // Recurse through all children.
  foreach (element_children($elements) as $key) {
    if (isset($elements[$key]) && $elements[$key]) {
      _form_validate($elements[$key]);
    }
  }

  /* Validate the current input */
  if (!isset($elements['#validated']) || !$elements['#validated']) {
    if (isset($elements['#needs_validation'])) {

      // Make sure a value is passed when the field is required.
      // A simple call to empty() will not cut it here as some fields, like
      // checkboxes, can return a valid value of '0'. Instead, check the
      // length if it's a string, and the item count if it's an array.
      if ($elements['#required'] && (!count($elements['#value']) || is_string($elements['#value']) && strlen(trim($elements['#value'])) == 0)) {
        form_error($elements, t('!name field is required.', array(
          '!name' => $elements['#title'],
        )));
      }

      // Verify that the value is not longer than #maxlength.
      if (isset($elements['#maxlength']) && drupal_strlen($elements['#value']) > $elements['#maxlength']) {
        form_error($elements, t('!name cannot be longer than %max characters but is currently %length characters long.', array(
          '!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'],
          '%max' => $elements['#maxlength'],
          '%length' => drupal_strlen($elements['#value']),
        )));
      }

      // Add legal choice check if element has #options. Can be skipped, but
      // then you must validate your own element.
      if (isset($elements['#options']) && isset($elements['#value']) && !isset($elements['#DANGEROUS_SKIP_CHECK'])) {
        if ($elements['#type'] == 'select') {
          $options = form_options_flatten($elements['#options']);
        }
        else {
          $options = $elements['#options'];
        }
        if (is_array($elements['#value'])) {
          $value = $elements['#type'] == 'checkboxes' ? array_keys(array_filter($elements['#value'])) : $elements['#value'];
          foreach ($value as $v) {
            if (!isset($options[$v])) {
              form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
              watchdog('form', t('Illegal choice %choice in !name element.', array(
                '%choice' => $v,
                '!name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'],
              )), WATCHDOG_ERROR);
            }
          }
        }
        elseif (!isset($options[$elements['#value']])) {
          form_error($elements, t('An illegal choice has been detected. Please contact the site administrator.'));
          watchdog('form', t('Illegal choice %choice in %name element.', array(
            '%choice' => $elements['#value'],
            '%name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title'],
          )), WATCHDOG_ERROR);
        }
      }
    }

    // Call user-defined validators.
    if (isset($elements['#validate'])) {
      foreach ($elements['#validate'] as $function => $args) {
        $args = array_merge(array(
          $elements,
        ), $args);

        // For the full form we hand over a copy of $form_values.
        if (isset($form_id)) {
          $args = array_merge(array(
            $form_id,
            $GLOBALS['form_values'],
          ), $args);
        }
        if (function_exists($function)) {
          call_user_func_array($function, $args);
        }
      }
    }
    $elements['#validated'] = TRUE;
  }
}

/**
 * File an error against a form element. If the name of the element is
 * edit[foo][bar] then you may pass either foo or foo][bar as $name
 * foo will set an error for all its children.
 */
function form_set_error($name = NULL, $message = '') {
  static $form = array();
  if (isset($name) && !isset($form[$name])) {
    $form[$name] = $message;
    if ($message) {
      drupal_set_message($message, 'error');
    }
  }
  return $form;
}

/**
 * Return an associative array of all errors.
 */
function form_get_errors() {
  $form = form_set_error();
  if (!empty($form)) {
    return $form;
  }
}

/**
 * Return the error message filed against the form with the specified name.
 */
function form_get_error($element) {
  $form = form_set_error();
  $key = $element['#parents'][0];
  if (isset($form[$key])) {
    return $form[$key];
  }
  $key = implode('][', $element['#parents']);
  if (isset($form[$key])) {
    return $form[$key];
  }
}

/**
 * Flag an element as having an error.
 */
function form_error(&$element, $message = '') {
  $element['#error'] = TRUE;
  form_set_error(implode('][', $element['#parents']), $message);
}

/**
 * Adds some required properties to each form element, which are used
 * internally in the form API. This function also automatically assigns
 * the value property from the $edit array, provided the element doesn't
 * already have an assigned value.
 *
 * @param $form_id
 *   A unique string identifying the form for validation, submission,
 *   theming, and hook_form_alter functions.
 * @param $form
 *   An associative array containing the structure of the form.
 */
function form_builder($form_id, $form) {
  global $form_values, $form_submitted, $form_button_counter;

  // Initialize as unprocessed.
  $form['#processed'] = FALSE;

  /* Use element defaults */
  if (!empty($form['#type']) && ($info = _element_info($form['#type']))) {

    // Overlay $info onto $form, retaining preexisting keys in $form.
    $form += $info;
  }
  if (isset($form['#input']) && $form['#input']) {
    if (!isset($form['#name'])) {
      $name = array_shift($form['#parents']);
      $form['#name'] = $name;
      if ($form['#type'] == 'file') {

        // To make it easier to handle $_FILES in file.inc, we place all
        // file fields in the 'files' array. Also, we do not support
        // nested file names.
        $form['#name'] = 'files[' . $form['#name'] . ']';
      }
      elseif (count($form['#parents'])) {
        $form['#name'] .= '[' . implode('][', $form['#parents']) . ']';
      }
      array_unshift($form['#parents'], $name);
    }
    if (!isset($form['#id'])) {
      $form['#id'] = form_clean_id('edit-' . implode('-', $form['#parents']));
    }
    if (isset($form['#disabled']) && $form['#disabled']) {
      $form['#attributes']['disabled'] = 'disabled';
    }
    if (!isset($form['#value']) && !array_key_exists('#value', $form)) {
      if ($form['#programmed'] || (!isset($form['#access']) || $form['#access']) && isset($form['#post']) && (isset($form['#post']['form_id']) && $form['#post']['form_id'] == $form_id)) {
        $edit = $form['#post'];
        foreach ($form['#parents'] as $parent) {
          $edit = isset($edit[$parent]) ? $edit[$parent] : NULL;
        }
        if (!$form['#programmed'] || isset($edit)) {
          switch ($form['#type']) {
            case 'checkbox':
              $form['#value'] = !empty($edit) ? $form['#return_value'] : 0;
              break;
            case 'select':
              if (isset($form['#multiple']) && $form['#multiple']) {
                if (isset($edit) && is_array($edit)) {
                  $form['#value'] = drupal_map_assoc($edit);
                }
                else {
                  $form['#value'] = array();
                }
              }
              elseif (isset($edit)) {
                $form['#value'] = $edit;
              }
              break;
            case 'textfield':
              if (isset($edit)) {

                // Equate $edit to the form value to ensure it's marked for
                // validation.
                $edit = str_replace(array(
                  "\r",
                  "\n",
                ), '', $edit);
                $form['#value'] = $edit;
              }
              break;
            case 'token':
              $form['#value'] = (string) $edit;
              break;
            default:
              if (isset($edit)) {
                $form['#value'] = $edit;
              }
          }

          // Mark all posted values for validation.
          if (isset($form['#value']) && $form['#value'] === $edit || isset($form['#required']) && $form['#required']) {
            $form['#needs_validation'] = TRUE;
          }
        }
      }
      if (!isset($form['#value'])) {
        $function = $form['#type'] . '_value';
        if (function_exists($function)) {
          $function($form);
        }
        else {
          $form['#value'] = isset($form['#default_value']) ? $form['#default_value'] : '';
        }
      }
    }
    if (isset($form['#executes_submit_callback'])) {

      // Count submit and non-submit buttons.
      $form_button_counter[$form['#executes_submit_callback']]++;

      // See if a submit button was pressed.
      if (isset($form['#post'][$form['#name']]) && $form['#post'][$form['#name']] == $form['#value']) {
        $form_submitted = $form_submitted || $form['#executes_submit_callback'];

        // In most cases, we want to use form_set_value() to manipulate the
        // global variables. In this special case, we want to make sure that
        // the value of this element is listed in $form_variables under 'op'.
        $form_values[$form['#name']] = $form['#value'];
      }
    }
  }

  // Allow for elements to expand to multiple elements, e.g., radios,
  // checkboxes and files.
  if (isset($form['#process']) && !$form['#processed']) {
    foreach ($form['#process'] as $process => $args) {
      if (function_exists($process)) {
        $args = array_merge(array(
          $form,
        ), array(
          $edit,
        ), $args);
        $form = call_user_func_array($process, $args);
      }
    }
    $form['#processed'] = TRUE;
  }

  // Set the $form_values key that gets passed to validate and submit.
  // We call this after #process gets called so that #process has a
  // chance to update #value if desired.
  if (isset($form['#input']) && $form['#input']) {
    form_set_value($form, $form['#value']);
  }

  // We start off assuming all form elements are in the correct order.
  $form['#sorted'] = TRUE;

  // Recurse through all child elements.
  $count = 0;
  foreach (element_children($form) as $key) {
    $form[$key]['#post'] = $form['#post'];
    $form[$key]['#programmed'] = $form['#programmed'];

    // Don't squash an existing tree value.
    if (!isset($form[$key]['#tree'])) {
      $form[$key]['#tree'] = $form['#tree'];
    }

    // Deny access to child elements if parent is denied.
    if (isset($form['#access']) && !$form['#access']) {
      $form[$key]['#access'] = FALSE;
    }

    // Don't squash existing parents value.
    if (!isset($form[$key]['#parents'])) {

      // Check to see if a tree of child elements is present. If so,
      // continue down the tree if required.
      $form[$key]['#parents'] = $form[$key]['#tree'] && $form['#tree'] ? array_merge($form['#parents'], array(
        $key,
      )) : array(
        $key,
      );
    }

    // Assign a decimal placeholder weight to preserve original array order.
    if (!isset($form[$key]['#weight'])) {
      $form[$key]['#weight'] = $count / 1000;
    }
    else {

      // If one of the child elements has a weight then we will need to sort
      // later.
      unset($form['#sorted']);
    }
    $form[$key] = form_builder($form_id, $form[$key]);
    $count++;
  }
  if (isset($form['#after_build']) && !isset($form['#after_build_done'])) {
    foreach ($form['#after_build'] as $function) {
      if (function_exists($function)) {
        $form = $function($form, $form_values);
      }
    }
    $form['#after_build_done'] = TRUE;
  }
  return $form;
}

/**
 * Use this function to make changes to form values in the form validate
 * phase, so they will be available in the submit phase in $form_values.
 *
 * Specifically, if $form['#parents'] is array('foo', 'bar')
 * and $value is 'baz' then this function will make
 * $form_values['foo']['bar'] to be 'baz'.
 *
 * @param $form
 *   The form item. Keys used: #parents, #value
 * @param $value
 *   The value for the form item.
 */
function form_set_value($form, $value) {
  global $form_values;
  _form_set_value($form_values, $form, $form['#parents'], $value);
}

/**
 * Helper function for form_set_value().
 *
 * We iterate over $parents and create nested arrays for them
 * in $form_values if needed. Then we insert the value into
 * the right array.
 */
function _form_set_value(&$form_values, $form, $parents, $value) {
  $parent = array_shift($parents);
  if (empty($parents)) {
    $form_values[$parent] = $value;
  }
  else {
    if (!isset($form_values[$parent])) {
      $form_values[$parent] = array();
    }
    _form_set_value($form_values[$parent], $form, $parents, $value);
  }
  return $form;
}

/**
 * Retrieve the default properties for the defined element type.
 */
function _element_info($type, $refresh = NULL) {
  static $cache;
  $basic_defaults = array(
    '#description' => NULL,
    '#attributes' => array(),
    '#required' => FALSE,
    '#tree' => FALSE,
    '#parents' => array(),
  );
  if (!isset($cache) || $refresh) {
    $cache = array();
    foreach (module_implements('elements') as $module) {
      $elements = module_invoke($module, 'elements');
      if (isset($elements) && is_array($elements)) {
        $cache = array_merge_recursive($cache, $elements);
      }
    }
    if (sizeof($cache)) {
      foreach ($cache as $element_type => $info) {
        $cache[$element_type] = array_merge_recursive($basic_defaults, $info);
      }
    }
  }
  return $cache[$type];
}
function form_options_flatten($array, $reset = TRUE) {
  static $return;
  if ($reset) {
    $return = array();
  }
  foreach ($array as $key => $value) {
    if (is_object($value)) {
      form_options_flatten($value->option, FALSE);
    }
    else {
      if (is_array($value)) {
        form_options_flatten($value, FALSE);
      }
      else {
        $return[$key] = 1;
      }
    }
  }
  return $return;
}

/**
 * Format a dropdown menu or scrolling selection box.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: title, value, options, description, extra, multiple, required
 * @return
 *   A themed HTML string representing the form element.
 *
 * It is possible to group options together; to do this, change the format of
 * $options to an associative array in which the keys are group labels, and the
 * values are associative arrays in the normal $options format.
 */
function theme_select($element) {
  $select = '';
  $size = $element['#size'] ? ' size="' . $element['#size'] . '"' : '';
  _form_set_class($element, array(
    'form-select',
  ));
  $multiple = isset($element['#multiple']) && $element['#multiple'];
  return theme('form_element', $element, '<select name="' . $element['#name'] . '' . ($multiple ? '[]' : '') . '"' . ($multiple ? ' multiple="multiple" ' : '') . drupal_attributes($element['#attributes']) . ' id="' . $element['#id'] . '" ' . $size . '>' . form_select_options($element) . '</select>');
}
function form_select_options($element, $choices = NULL) {
  if (!isset($choices)) {
    $choices = $element['#options'];
  }

  // array_key_exists() accommodates the rare event where $element['#value'] is NULL.
  // isset() fails in this situation.
  $value_valid = isset($element['#value']) || array_key_exists('#value', $element);
  $value_is_array = is_array($element['#value']);
  $options = '';
  foreach ($choices as $key => $choice) {
    if (is_array($choice)) {
      $options .= '<optgroup label="' . $key . '">';
      $options .= form_select_options($element, $choice);
      $options .= '</optgroup>';
    }
    elseif (is_object($choice)) {
      $options .= form_select_options($element, $choice->option);
    }
    else {
      $key = (string) $key;
      if ($value_valid && (!$value_is_array && (string) $element['#value'] === $key || $value_is_array && in_array($key, $element['#value']))) {
        $selected = ' selected="selected"';
      }
      else {
        $selected = '';
      }
      $options .= '<option value="' . check_plain($key) . '"' . $selected . '>' . check_plain($choice) . '</option>';
    }
  }
  return $options;
}

/**
 * Traverses a select element's #option array looking for any values
 * that hold the given key. Returns an array of indexes that match.
 *
 * This function is useful if you need to modify the options that are
 * already in a form element; for example, to remove choices which are
 * not valid because of additional filters imposed by another module.
 * One example might be altering the choices in a taxonomy selector.
 * To correctly handle the case of a multiple hierarchy taxonomy,
 * #options arrays can now hold an array of objects, instead of a
 * direct mapping of keys to labels, so that multiple choices in the
 * selector can have the same key (and label). This makes it difficult
 * to manipulate directly, which is why this helper function exists.
 *
 * This function does not support optgroups (when the elements of the
 * #options array are themselves arrays), and will return FALSE if
 * arrays are found. The caller must either flatten/restore or
 * manually do their manipulations in this case, since returning the
 * index is not sufficient, and supporting this would make the
 * "helper" too complicated and cumbersome to be of any help.
 *
 * As usual with functions that can return array() or FALSE, do not
 * forget to use === and !== if needed.
 *
 * @param $element
 *   The select element to search.
 * @param $key
 *   The key to look for.
 * @return
 *   An array of indexes that match the given $key. Array will be
 *   empty if no elements were found. FALSE if optgroups were found.
 */
function form_get_options($element, $key) {
  $keys = array();
  foreach ($element['#options'] as $index => $choice) {
    if (is_array($choice)) {
      return FALSE;
    }
    else {
      if (is_object($choice)) {
        if (isset($choice->option[$key])) {
          $keys[] = $index;
        }
      }
      else {
        if ($index == $key) {
          $keys[] = $index;
        }
      }
    }
  }
  return $keys;
}

/**
 * Format a group of form items.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: attributes, title, value, description, children, collapsible, collapsed
 * @return
 *   A themed HTML string representing the form item group.
 */
function theme_fieldset($element) {
  if ($element['#collapsible']) {
    drupal_add_js('misc/collapse.js');
    if (!isset($element['#attributes']['class'])) {
      $element['#attributes']['class'] = '';
    }
    $element['#attributes']['class'] .= ' collapsible';
    if ($element['#collapsed']) {
      $element['#attributes']['class'] .= ' collapsed';
    }
  }
  return '<fieldset' . drupal_attributes($element['#attributes']) . '>' . ($element['#title'] ? '<legend>' . $element['#title'] . '</legend>' : '') . ($element['#description'] ? '<div class="description">' . $element['#description'] . '</div>' : '') . $element['#children'] . $element['#value'] . "</fieldset>\n";
}

/**
 * Format a radio button.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: required, return_value, value, attributes, title, description
 * @return
 *   A themed HTML string representing the form item group.
 */
function theme_radio($element) {
  _form_set_class($element, array(
    'form-radio',
  ));
  $output = '<input type="radio" ';
  $output .= 'name="' . $element['#name'] . '" ';
  $output .= 'value="' . $element['#return_value'] . '" ';
  $output .= check_plain($element['#value']) == $element['#return_value'] ? ' checked="checked" ' : ' ';
  $output .= drupal_attributes($element['#attributes']) . ' />';
  if (!is_null($element['#title'])) {
    $output = '<label class="option">' . $output . ' ' . $element['#title'] . '</label>';
  }
  unset($element['#title']);
  return theme('form_element', $element, $output);
}

/**
 * Format a set of radio buttons.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: title, value, options, description, required and attributes.
 * @return
 *   A themed HTML string representing the radio button set.
 */
function theme_radios($element) {
  $class = 'form-radios';
  if (isset($element['#attributes']['class'])) {
    $class .= ' ' . $element['#attributes']['class'];
  }
  $element['#children'] = '<div class="' . $class . '">' . $element['#children'] . '</div>';
  if ($element['#title'] || $element['#description']) {
    unset($element['#id']);
    return theme('form_element', $element, $element['#children']);
  }
  else {
    return $element['#children'];
  }
}

/**
 * Format a password_confirm item.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: title, value, id, required, error.
 * @return
 *   A themed HTML string representing the form item.
 */
function theme_password_confirm($element) {
  return theme('form_element', $element, $element['#children']);
}

/**
 * Expand a password_confirm field into two text boxes.
 */
function expand_password_confirm($element) {
  $element['pass1'] = array(
    '#type' => 'password',
    '#title' => t('Password'),
    '#value' => $element['#value']['pass1'],
    '#required' => $element['#required'],
  );
  $element['pass2'] = array(
    '#type' => 'password',
    '#title' => t('Confirm password'),
    '#value' => $element['#value']['pass2'],
    '#required' => $element['#required'],
  );
  $element['#validate'] = array(
    'password_confirm_validate' => array(),
  );
  $element['#tree'] = TRUE;
  if (isset($element['#size'])) {
    $element['pass1']['#size'] = $element['pass2']['#size'] = $element['#size'];
  }
  return $element;
}

/**
 * Validate password_confirm element.
 */
function password_confirm_validate($form) {
  $pass1 = trim($form['pass1']['#value']);
  if (!empty($pass1)) {
    $pass2 = trim($form['pass2']['#value']);
    if ($pass1 != $pass2) {
      form_error($form, t('The specified passwords do not match.'));
    }
  }
  elseif ($form['#required'] && !empty($form['#post'])) {
    form_error($form, t('Password field is required.'));
  }

  // Password field must be converted from a two-element array into a single
  // string regardless of validation results.
  form_set_value($form['pass1'], NULL);
  form_set_value($form['pass2'], NULL);
  form_set_value($form, $pass1);
  return $form;
}

/**
 * Format a date selection element.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: title, value, options, description, required and attributes.
 * @return
 *   A themed HTML string representing the date selection boxes.
 */
function theme_date($element) {
  return theme('form_element', $element, '<div class="container-inline">' . $element['#children'] . '</div>');
}

/**
 * Roll out a single date element.
 */
function expand_date($element) {

  // Default to current date
  if (empty($element['#value'])) {
    $element['#value'] = array(
      'day' => format_date(time(), 'custom', 'j'),
      'month' => format_date(time(), 'custom', 'n'),
      'year' => format_date(time(), 'custom', 'Y'),
    );
  }
  $element['#tree'] = TRUE;

  // Determine the order of day, month, year in the site's chosen date format.
  $format = variable_get('date_format_short', 'm/d/Y - H:i');
  $sort = array();
  $sort['day'] = max(strpos($format, 'd'), strpos($format, 'j'));
  $sort['month'] = max(strpos($format, 'm'), strpos($format, 'M'));
  $sort['year'] = strpos($format, 'Y');
  asort($sort);
  $order = array_keys($sort);

  // Output multi-selector for date.
  foreach ($order as $type) {
    switch ($type) {
      case 'day':
        $options = drupal_map_assoc(range(1, 31));
        break;
      case 'month':
        $options = drupal_map_assoc(range(1, 12), 'map_month');
        break;
      case 'year':
        $options = drupal_map_assoc(range(1900, 2050));
        break;
    }
    $parents = $element['#parents'];
    $parents[] = $type;
    $element[$type] = array(
      '#type' => 'select',
      '#value' => $element['#value'][$type],
      '#attributes' => $element['#attributes'],
      '#options' => $options,
    );
  }
  return $element;
}

/**
 * Validates the date type to stop dates like February 30, 2006.
 */
function date_validate($form) {
  if (!checkdate($form['#value']['month'], $form['#value']['day'], $form['#value']['year'])) {
    form_error($form, t('The specified date is invalid.'));
  }
}

/**
 * Helper function for usage with drupal_map_assoc to display month names.
 */
function map_month($month) {
  return format_date(gmmktime(0, 0, 0, $month, 2, 1970), 'custom', 'M', 0);
}

/**
 * Helper function to load value from default value for checkboxes.
 */
function checkboxes_value(&$form) {
  $value = array();
  foreach ((array) $form['#default_value'] as $key) {
    $value[$key] = 1;
  }
  $form['#value'] = $value;
}

/**
 * If no default value is set for weight select boxes, use 0.
 */
function weight_value(&$form) {
  if (isset($form['#default_value'])) {
    $form['#value'] = $form['#default_value'];
  }
  else {
    $form['#value'] = 0;
  }
}

/**
 * Roll out a single radios element to a list of radios,
 * using the options array as index.
 */
function expand_radios($element) {
  if (count($element['#options']) > 0) {
    foreach ($element['#options'] as $key => $choice) {
      if (!isset($element[$key])) {

        // Generate the parents as the autogenerator does, so we will have a
        // unique id for each radio button.
        $parents_for_id = array_merge($element['#parents'], array(
          $key,
        ));
        $element[$key] = array(
          '#type' => 'radio',
          '#title' => $choice,
          '#return_value' => check_plain($key),
          '#default_value' => $element['#default_value'],
          '#attributes' => $element['#attributes'],
          '#id' => form_clean_id('edit-' . implode('-', $parents_for_id)),
          '#parents' => $element['#parents'],
          '#spawned' => TRUE,
        );
      }
    }
  }
  return $element;
}

/**
 * Format a form item.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used:  title, value, description, required, error
 * @return
 *   A themed HTML string representing the form item.
 */
function theme_item($element) {
  return theme('form_element', $element, $element['#value'] . $element['#children']);
}

/**
 * Format a checkbox.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used:  title, value, return_value, description, required
 * @return
 *   A themed HTML string representing the checkbox.
 */
function theme_checkbox($element) {
  _form_set_class($element, array(
    'form-checkbox',
  ));
  $checkbox = '<input ';
  $checkbox .= 'type="checkbox" ';
  $checkbox .= 'name="' . $element['#name'] . '" ';
  $checkbox .= 'id="' . $element['#id'] . '" ';
  $checkbox .= 'value="' . $element['#return_value'] . '" ';
  $checkbox .= $element['#value'] ? ' checked="checked" ' : ' ';
  $checkbox .= drupal_attributes($element['#attributes']) . ' />';
  if (!is_null($element['#title'])) {
    $checkbox = '<label class="option">' . $checkbox . ' ' . $element['#title'] . '</label>';
  }
  unset($element['#title']);
  return theme('form_element', $element, $checkbox);
}

/**
 * Format a set of checkboxes.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 * @return
 *   A themed HTML string representing the checkbox set.
 */
function theme_checkboxes($element) {
  $class = 'form-checkboxes';
  if (isset($element['#attributes']['class'])) {
    $class .= ' ' . $element['#attributes']['class'];
  }
  $element['#children'] = '<div class="' . $class . '">' . $element['#children'] . '</div>';
  if ($element['#title'] || $element['#description']) {
    unset($element['#id']);
    return theme('form_element', $element, $element['#children']);
  }
  else {
    return $element['#children'];
  }
}
function expand_checkboxes($element) {
  $value = is_array($element['#value']) ? $element['#value'] : array();
  $element['#tree'] = TRUE;
  if (count($element['#options']) > 0) {
    if (!isset($element['#default_value']) || $element['#default_value'] == 0) {
      $element['#default_value'] = array();
    }
    foreach ($element['#options'] as $key => $choice) {
      if (!isset($element[$key])) {
        $element[$key] = array(
          '#type' => 'checkbox',
          '#processed' => TRUE,
          '#title' => $choice,
          '#return_value' => $key,
          '#default_value' => isset($value[$key]),
          '#attributes' => $element['#attributes'],
        );
      }
    }
  }
  return $element;
}
function theme_submit($element) {
  return theme('button', $element);
}
function theme_button($element) {

  // Make sure not to overwrite classes.
  if (isset($element['#attributes']['class'])) {
    $element['#attributes']['class'] = 'form-' . $element['#button_type'] . ' ' . $element['#attributes']['class'];
  }
  else {
    $element['#attributes']['class'] = 'form-' . $element['#button_type'];
  }
  return '<input type="submit" ' . (empty($element['#name']) ? '' : 'name="' . $element['#name'] . '" ') . 'id="' . $element['#id'] . '" value="' . check_plain($element['#value']) . '" ' . drupal_attributes($element['#attributes']) . " />\n";
}

/**
 * Format a hidden form field.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used:  value, edit
 * @return
 *   A themed HTML string representing the hidden form field.
 */
function theme_hidden($element) {
  return '<input type="hidden" name="' . $element['#name'] . '" id="' . $element['#id'] . '" value="' . check_plain($element['#value']) . "\" " . drupal_attributes($element['#attributes']) . " />\n";
}
function theme_token($element) {
  return theme('hidden', $element);
}

/**
 * Format a textfield.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used:  title, value, description, size, maxlength, required, attributes autocomplete_path
 * @return
 *   A themed HTML string representing the textfield.
 */
function theme_textfield($element) {
  $size = $element['#size'] ? ' size="' . $element['#size'] . '"' : '';
  $class = array(
    'form-text',
  );
  $extra = '';
  $output = '';
  if ($element['#autocomplete_path']) {
    drupal_add_js('misc/autocomplete.js');
    $class[] = 'form-autocomplete';
    $extra = '<input class="autocomplete" type="hidden" id="' . $element['#id'] . '-autocomplete" value="' . check_url(url($element['#autocomplete_path'], NULL, NULL, TRUE)) . '" disabled="disabled" />';
  }
  _form_set_class($element, $class);
  if (isset($element['#field_prefix'])) {
    $output .= '<span class="field-prefix">' . $element['#field_prefix'] . '</span> ';
  }
  $output .= '<input type="text" maxlength="' . $element['#maxlength'] . '" name="' . $element['#name'] . '" id="' . $element['#id'] . '" ' . $size . ' value="' . check_plain($element['#value']) . '"' . drupal_attributes($element['#attributes']) . ' />';
  if (isset($element['#field_suffix'])) {
    $output .= ' <span class="field-suffix">' . $element['#field_suffix'] . '</span>';
  }
  return theme('form_element', $element, $output) . $extra;
}

/**
 * Format a form.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: action, method, attributes, children
 * @return
 *   A themed HTML string representing the form.
 */
function theme_form($element) {

  // Anonymous div to satisfy XHTML compliance.
  $action = $element['#action'] ? 'action="' . check_url($element['#action']) . '" ' : '';
  return '<form ' . $action . ' accept-charset="UTF-8" method="' . $element['#method'] . '" ' . 'id="' . $element['#id'] . '"' . drupal_attributes($element['#attributes']) . ">\n<div>" . $element['#children'] . "\n</div></form>\n";
}

/**
 * Format a textarea.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: title, value, description, rows, cols, required, attributes
 * @return
 *   A themed HTML string representing the textarea.
 */
function theme_textarea($element) {
  $class = array(
    'form-textarea',
  );
  if ($element['#resizable'] !== FALSE) {
    drupal_add_js('misc/textarea.js');
    $class[] = 'resizable';
  }
  $cols = $element['#cols'] ? ' cols="' . $element['#cols'] . '"' : '';
  _form_set_class($element, $class);
  return theme('form_element', $element, '<textarea' . $cols . ' rows="' . $element['#rows'] . '" name="' . $element['#name'] . '" id="' . $element['#id'] . '" ' . drupal_attributes($element['#attributes']) . '>' . check_plain($element['#value']) . '</textarea>');
}

/**
 * Format HTML markup for use in forms.
 *
 * This is used in more advanced forms, such as theme selection and filter format.
 *
 * @param $element
 *   An associative array containing the properties of the element.
 *   Properties used: value, children.
 * @return
 *   A themed HTML string representing the HTML markup.
 */
function theme_markup($element) {
  return (isset($element['#value']) ? $element['#value'] : '') . (isset($element['#children']) ? $element['#children'] : '');
}

/**
* Format a password field.
*
* @param $element
*   An associative array containing the properties of the element.
*   Properties used:  title, value, description, size, maxlength, required, attributes
* @return
*   A themed HTML string representing the form.
*/
function theme_password($element) {
  $size = $element['#size'] ? ' size="' . $element['#size'] . '" ' : '';
  $maxlength = $element['#maxlength'] ? ' maxlength="' . $element['#maxlength'] . '" ' : '';
  _form_set_class($element, array(
    'form-text',
  ));
  $output = '<input type="password" name="' . $element['#name'] . '" id="' . $element['#id'] . '" ' . $maxlength . $size . drupal_attributes($element['#attributes']) . ' />';
  return theme('form_element', $element, $output);
}

/**
 * Expand weight elements into selects.
 */
function process_weight($element) {
  for ($n = -1 * $element['#delta']; $n <= $element['#delta']; $n++) {
    $weights[$n] = $n;
  }
  $element['#options'] = $weights;
  $element['#type'] = 'select';
  $element['#is_weight'] = TRUE;
  return $element;
}

/**
 * Format a file upload field.
 *
 * @param $title
 *   The label for the file upload field.
 * @param $name
 *   The internal name used to refer to the field.
 * @param $size
 *   A measure of the visible size of the field (passed directly to HTML).
 * @param $description
 *   Explanatory text to display after the form item.
 * @param $required
 *   Whether the user must upload a file to the field.
 * @return
 *   A themed HTML string representing the field.
 *
 * For assistance with handling the uploaded file correctly, see the API
 * provided by file.inc.
 */
function theme_file($element) {
  _form_set_class($element, array(
    'form-file',
  ));
  return theme('form_element', $element, '<input type="file" name="' . $element['#name'] . '"' . ($element['#attributes'] ? ' ' . drupal_attributes($element['#attributes']) : '') . ' id="' . $element['#id'] . '" size="' . $element['#size'] . "\" />\n");
}

/**
 * Return a themed form element.
 *
 * @param element
 *   An associative array containing the properties of the element.
 *   Properties used: title, description, id, required
 * @param $value
 *   The form element's data.
 * @return
 *   A string representing the form element.
 */
function theme_form_element($element, $value) {
  $output = '<div class="form-item"';
  if (!empty($element['#id'])) {
    $output .= ' id="' . $element['#id'] . '-wrapper"';
  }
  $output .= ">\n";
  $required = !empty($element['#required']) ? '<span class="form-required" title="' . t('This field is required.') . '">*</span>' : '';
  if (!empty($element['#title'])) {
    $title = $element['#title'];
    if (!empty($element['#id'])) {
      $output .= ' <label for="' . $element['#id'] . '">' . t('!title: !required', array(
        '!title' => filter_xss_admin($title),
        '!required' => $required,
      )) . "</label>\n";
    }
    else {
      $output .= ' <label>' . t('!title: !required', array(
        '!title' => filter_xss_admin($title),
        '!required' => $required,
      )) . "</label>\n";
    }
  }
  $output .= " {$value}\n";
  if (!empty($element['#description'])) {
    $output .= ' <div class="description">' . $element['#description'] . "</div>\n";
  }
  $output .= "</div>\n";
  return $output;
}

/**
 * Sets a form element's class attribute.
 *
 * Adds 'required' and 'error' classes as needed.
 *
 * @param &$element
 *   The form element.
 * @param $name
 *   Array of new class names to be added.
 */
function _form_set_class(&$element, $class = array()) {
  if ($element['#required']) {
    $class[] = 'required';
  }
  if (form_get_error($element)) {
    $class[] = 'error';
  }
  if (isset($element['#attributes']['class'])) {
    $class[] = $element['#attributes']['class'];
  }
  $element['#attributes']['class'] = implode(' ', $class);
}

/**
 * Remove invalid characters from an HTML ID attribute string.
 *
 * @param $id
 *   The ID to clean.
 * @return
 *   The cleaned ID.
 */
function form_clean_id($id = NULL) {
  $id = str_replace(array(
    '][',
    '_',
    ' ',
  ), '-', $id);
  return $id;
}

/**
 * @} End of "defgroup form".
 */

Functions

Namesort descending Description
checkboxes_value Helper function to load value from default value for checkboxes.
date_validate Validates the date type to stop dates like February 30, 2006.
drupal_execute Retrieves a form using a form_id, populates it with $form_values, processes it, and returns any validation errors encountered. This function is the programmatic counterpart to drupal_get_form().
drupal_get_form Retrieves a form from a builder function, passes it on for processing, and renders the form or redirects to its destination as appropriate. In multi-step form scenarios, it handles properly processing the values using the previous step's form…
drupal_prepare_form Prepares a structured form array by adding required elements, executing any hook_form_alter functions, and optionally inserting a validation token to prevent tampering.
drupal_process_form This function is the heart of form API. The form gets built, validated and in appropriate cases, submitted.
drupal_redirect_form Redirect the user to a URL after a form has been processed.
drupal_render_form Renders a structured form array into themed HTML.
drupal_retrieve_form Retrieves the structured array that defines a given form.
drupal_submit_form Processes user-submitted form data from a global variable using the submit functions defined in a structured form array.
drupal_validate_form Validates user-submitted form data from a global variable using the validate functions defined in a structured form array.
expand_checkboxes
expand_date Roll out a single date element.
expand_password_confirm Expand a password_confirm field into two text boxes.
expand_radios Roll out a single radios element to a list of radios, using the options array as index.
form_builder Adds some required properties to each form element, which are used internally in the form API. This function also automatically assigns the value property from the $edit array, provided the element doesn't already have an assigned value.
form_clean_id Remove invalid characters from an HTML ID attribute string.
form_error Flag an element as having an error.
form_get_error Return the error message filed against the form with the specified name.
form_get_errors Return an associative array of all errors.
form_get_options Traverses a select element's #option array looking for any values that hold the given key. Returns an array of indexes that match.
form_options_flatten
form_select_options
form_set_error File an error against a form element. If the name of the element is edit[foo][bar] then you may pass either foo or foo][bar as $name foo will set an error for all its children.
form_set_value Use this function to make changes to form values in the form validate phase, so they will be available in the submit phase in $form_values.
map_month Helper function for usage with drupal_map_assoc to display month names.
password_confirm_validate Validate password_confirm element.
process_weight Expand weight elements into selects.
theme_button
theme_checkbox Format a checkbox.
theme_checkboxes Format a set of checkboxes.
theme_date Format a date selection element.
theme_fieldset Format a group of form items.
theme_file Format a file upload field.
theme_form Format a form.
theme_form_element Return a themed form element.
theme_hidden Format a hidden form field.
theme_item Format a form item.
theme_markup Format HTML markup for use in forms.
theme_password Format a password field.
theme_password_confirm Format a password_confirm item.
theme_radio Format a radio button.
theme_radios Format a set of radio buttons.
theme_select Format a dropdown menu or scrolling selection box.
theme_submit
theme_textarea Format a textarea.
theme_textfield Format a textfield.
theme_token
weight_value If no default value is set for weight select boxes, use 0.
_drupal_clean_form_sessions Remove form information that's at least a day old from the $_SESSION['form'] array.
_element_info Retrieve the default properties for the defined element type.
_form_set_class Sets a form element's class attribute.
_form_set_value Helper function for form_set_value().
_form_validate Performs validation on form elements. First ensures required fields are completed, #maxlength is not exceeded, and selected options were in the list of options given to the user. Then calls user-defined validators.