has_filter


has_filter ( $tag, $function_to_check = false )

Parameters:
  • (string) tag The name of the filter hook.
  • (callable|false) function_to_check 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.
Defined at:

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.

Related Functions

add_filter, has_term, apply_filters, wp_list_filter, has_category

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