apply_filters ( $tag, $value )

  • (string) $tag The name of the filter hook.
  • (mixed) $value The value to filter.
  • (mixed) ...$args Additional parameters to pass to the callback functions.
  • (mixed) The filtered value after all hooked functions are applied to it.
Defined at:


Calls the callback functions that have been added to a filter hook.

The callback functions attached to the filter hook are invoked by calling this function. This function can be used to create a new filter hook by simply calling this function with the name of the new hook specified using the $tag parameter.

The function also allows for multiple additional arguments to be passed to hooks.

Example usage:

// The filter callback function
function example_callback( $string, $arg1, $arg2 ) {
    // (maybe) modify $string
    return $string;
add_filter( 'example_filter', 'example_callback', 10, 3 );

 * Apply the filters by calling the 'example_callback()' function that's
 * hooked onto `example_filter` above.
 * - 'example_filter' is the filter hook
 * - 'filter me' is the value being filtered
 * - $arg1 and $arg2 are the additional arguments passed to the callback.
$value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );

Related Functions

apply_filters_ref_array, apply_filters_deprecated, has_filter, add_filter, wp_list_filter

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