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Description

Checks if any filter has been registered for a hook.

When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false (e.g. 0), so use the === operator for testing the return value.

Usage

$bool|int = has_filter( $tag, $function_to_check );

Parameters

$tag

( string ) required – The name of the filter hook.

$function_to_check

( callable|false ) optional – Optional. The callback to check for. Default false.

Returns

bool|int If $function_to_check is omitted, returns boolean for whether the hook has anything registered. When checking a specific function, the priority of that hook is returned, or false if the function is not attached.

Source

File name: wordpress/wp-includes/plugin.php
Lines:

function has_filter( $tag, $function_to_check = false ) {
  global $wp_filter;

  if ( ! isset( $wp_filter[ $tag ] ) ) {
    return false;
  }

  return $wp_filter[ $tag ]->has_filter( $tag, $function_to_check );
}
 

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