4.6.x bootstrap.inc check_plain($text)
4.7.x bootstrap.inc check_plain($text)
5.x bootstrap.inc check_plain($text)
6.x bootstrap.inc check_plain($text)
7.x bootstrap.inc check_plain($text)

Encodes special characters in a plain-text string for display as HTML.

Also validates strings as UTF-8 to prevent cross site scripting attacks on Internet Explorer 6.


string $text: The text to be checked or processed.

Return value

string An HTML safe version of $text. If $text is not valid UTF-8, an empty string is returned and, on PHP < 5.4, a warning may be issued depending on server configuration (see https://bugs.php.net/bug.php?id=47494).

See also


Related topics

163 calls to check_plain()
aggregator_categorize_items in modules/aggregator/aggregator.pages.inc
Form constructor to build the page list form.
aggregator_form_feed in modules/aggregator/aggregator.admin.inc
Form constructor for adding and editing feed sources.
block_admin_display_form in modules/block/block.admin.inc
Form constructor for the main block administration form.
block_form_user_profile_form_alter in modules/block/block.module
Implements hook_form_FORM_ID_alter() for user_profile_form().
callback_batch_operation in modules/system/form.api.php
Perform a single batch operation.

... See full list

8 string references to 'check_plain'
aggregator_form_opml in modules/aggregator/aggregator.admin.inc
Form constructor for importing feeds from OPML.
block_admin_configure in modules/block/block.admin.inc
Form constructor for the block configuration form.
filter_admin_format_form in modules/filter/filter.admin.inc
Form constructor for the text format add/edit form.
node_form_search_form_alter in modules/node/node.module
Implements hook_form_FORM_ID_alter().
node_menu in modules/node/node.module
Implements hook_menu().

... See full list


includes/bootstrap.inc, line 1842
Functions that need to be loaded on every Drupal request.


function check_plain($text) {
  return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');


Chi’s picture

This function was moved to String utility component.

ranelpadon’s picture