1. 8.5.x core/includes/common.inc php_wrappers
  2. 8.0.x core/includes/common.inc php_wrappers
  3. 8.1.x core/includes/common.inc php_wrappers
  4. 8.2.x core/includes/common.inc php_wrappers
  5. 8.3.x core/includes/common.inc php_wrappers
  6. 8.4.x core/includes/common.inc php_wrappers
  7. 8.6.x core/includes/common.inc php_wrappers
  8. 7.x includes/common.inc php_wrappers

Functions that are wrappers or custom implementations of PHP functions.

Certain PHP functions should not be used in Drupal. Instead, Drupal's replacement functions should be used.

For example, for improved or more secure UTF8-handling, or RFC-compliant handling of URLs in Drupal.

For ease of use and memorizing, all these wrapper functions use the same name as the original PHP function, but prefixed with "drupal_". Beware, however, that not all wrapper functions support the same arguments as the original functions.

You should always use these wrapper functions in your code.


$my_substring = substr($original_string, 0, 5);


$my_substring = drupal_substr($original_string, 0, 5);


includes/common.inc, line 11
Common functions that many Drupal modules will need to reference.


Namesort descending Location Description
drupal_basename includes/file.inc Gets the filename from a given path.
drupal_chmod includes/file.inc Sets the permissions on a file or directory.
drupal_dirname includes/file.inc Gets the name of the directory from a given path.
drupal_http_build_query includes/common.inc Parses an array into a valid, rawurlencoded query string.
drupal_json_decode includes/common.inc Converts an HTML-safe JSON string into its PHP equivalent.
drupal_json_encode includes/common.inc Converts a PHP variable into its JavaScript equivalent.
drupal_mkdir includes/file.inc Creates a directory using Drupal's default mode.
drupal_move_uploaded_file includes/file.inc Moves an uploaded file to a new location.
drupal_parse_url includes/common.inc Parses a URL string into its path, query, and fragment components.
drupal_realpath includes/file.inc Resolves the absolute filepath of a local URI or filepath.
drupal_register_shutdown_function includes/bootstrap.inc Registers a function for execution on shutdown.
drupal_rmdir includes/file.inc Removes a directory.
drupal_session_regenerate includes/session.inc Called when an anonymous user becomes authenticated or vice-versa.
drupal_session_start includes/session.inc Starts a session forcefully, preserving already set session data.
drupal_set_time_limit includes/common.inc Attempts to set the PHP maximum execution time.
drupal_strlen includes/unicode.inc Counts the number of characters in a UTF-8 string.
drupal_strtolower includes/unicode.inc Lowercase a UTF-8 string.
drupal_strtoupper includes/unicode.inc Uppercase a UTF-8 string.
drupal_substr includes/unicode.inc Cuts off a piece of a string based on character indices and counts.
drupal_tempnam includes/file.inc Creates a file with a unique filename in the specified directory.
drupal_ucfirst includes/unicode.inc Capitalizes the first letter of a UTF-8 string.
drupal_unlink includes/file.inc Deletes a file.
drupal_xml_parser_create includes/unicode.inc Prepares a new XML parser.
php_eval modules/php/php.module Evaluates a string of PHP code.