PHP wrapper functions

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.

Wrong:

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

Correct:

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

File

core/includes/common.inc, line 25

Common functions that many Drupal modules will need to reference.

Functions