apply_filters()

apply_filters() — Calls the callback functions that have been added to a filter hook. This function invokes all functions attached to filter hook $hook_name. It is possible to create new filter hooks by simply calling this function, specifying the name of the new hook using the $hook_name 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.

Inputs: $hook_name (string): The name of the filter hook. $value (mixed): The value to filter.

Returns mixed: The filtered value after all hooked functions are applied to it.