_form_get_class

form_checkbox in includes/common.inc: Format a checkbox.
form_file in includes/common.inc: Format a file upload field.
form_password in includes/common.inc: Format a single-line text field that does not display its contents visibly.
form_radio in includes/common.inc: Format a radio button.
form_textarea in includes/common.inc: Format a multiple-line text field.
form_textfield in includes/common.inc: Format a single-line text field.

includes/common.inc, line 1032

<?php
function _form_get_class($name, $required, $error) {
  return $name. ($required ? ' required' : '') . ($error ? ' error' : '');
}
?>

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