After plugin options changed hook
Use the action update_option_{$option}, where $option is the same as the second argument for register_setting(). This hook fires after the option has been updated. add_filter( ‘update_option_directory’, ‘run_after_change’, 10, 2 ); function run_after_change( $old_value, $new_value ) { // compare both values and do something } 10 is the priority, 2 the number of accepted arguments for … Read more