Remove fuzzy actions and filters in WordPress

remove-fuzzy-hook.php

<?php

class Main {


	public function remove_fuzzy_hook( $hook_name, $callback, $priority ) {
		global $wp_filter;

		// Confirm the hook name exists.
		if ( isset( $wp_filter[ $hook_name ] ) && is_a( $wp_filter[ $hook_name ], 'WP_Hook' ) ) {
			// Confirm the hook contains callbacks.
			if ( property_exists( $wp_filter[ $hook_name ], 'callbacks' ) && is_array( $wp_filter[ $hook_name ]->callbacks ) ) {
				// Confirm the priority exists and contains callbacks.
				if ( isset( $wp_filter[ $hook_name ]->callbacks[ $priority ] ) && is_array( $wp_filter[ $hook_name ]->callbacks[ $priority ] ) ) {
					// Loop over the callbacks.
					foreach ( $wp_filter[ $hook_name ]->callbacks[ $priority ] as $function_key => $hook ) {
						// If an array is provided, confirm that the class names match.
						if ( is_array( $callback ) ) {
							// If it's an array, make sure that the object names match.
							if ( get_class( $hook['function'][0] ) !== $callback[0] ) {
								continue; // No match.
							}
							$callback = $callback[1];
						}
						// Look for a match.
						if ( isset( $hook['function'] ) && isset( $hook['function'][1] ) && $hook['function'][1] === $callback ) {
							// Use the default WordPress system to remove the callback using the correct name.
							remove_filter( $hook_name, $function_key, $priority );
						}
					}
				}
			}
		}
	}
}

use-example.php

<?php

class Fuzzy_Hooks_With_Instance {

	private static $instance = null;

	public static function getInstance() {
		if ( self::$instance == null ) {
			self::$instance = new Fuzzy_Hooks_With_Instance();
		}

		return self::$instance;
	}

	public function __construct() {
		add_action( 'wp', array( $this, 'die_early' ), 5 );
	}

	public function die_early() {
		die( 'Death by Fuzzy_Hooks_With_Instance' );
	}
}

class Fuzzy_Hooks {

	public function __construct() {
		add_action( 'wp', array( $this, 'die_early' ), 5 );
	}

	public function die_early() {
		die( 'Death by Fuzzy_Hooks' );
	}
}

class Other_Class {
	public function __construct() {
		add_action( 'init', array( $this, 'prevent_die' ) );
		add_action( 'wp', array( $this, 'die_anyway' ), 50 );
	}

	public function die_anyway() {
		die('Natural death.');
	}

	public function prevent_die() {
		// Does not work
		remove_action( 'wp', 'die_early', 5 );

		// Does not work.
		remove_action( 'wp', array( 'Fuzzy_Hooks', 'die_early' ), 5 );

		// Works when we can get an instance.
		$fuzzy_hooks = Fuzzy_Hooks_With_Instance::getInstance();
		remove_action( 'wp', array( $fuzzy_hooks, 'die_early' ), 5 );

		// Always works.
		$this->remove_fuzzy_hook( 'wp', array( 'Fuzzy_Hooks', 'die_early' ), 5 );
		$this->remove_fuzzy_hook( 'wp', 'die_early', 5 );
	}

	public function remove_fuzzy_hook( $hook_name, $callback, $priority ) {
		global $wp_filter;

		// Confirm the hook name exists.
		if ( isset( $wp_filter[ $hook_name ] ) && is_a( $wp_filter[ $hook_name ], 'WP_Hook' ) ) {
			// Confirm the hook contains callbacks.
			if ( property_exists( $wp_filter[ $hook_name ], 'callbacks' ) && is_array( $wp_filter[ $hook_name ]->callbacks ) ) {
				// Confirm the priority exists and contains callbacks.
				if ( isset( $wp_filter[ $hook_name ]->callbacks[ $priority ] ) && is_array( $wp_filter[ $hook_name ]->callbacks[ $priority ] ) ) {
					// Loop over the callbacks.
					foreach ( $wp_filter[ $hook_name ]->callbacks[ $priority ] as $function_key => $hook ) {
						// If an array is provided, confirm that the class names match.
						if ( is_array( $callback ) ) {
							// If it's an array, make sure that the object names match.
							if ( get_class( $hook['function'][0] ) !== $callback[0] ) {
								continue; // No match.
							}
							$callback = $callback[1];
						}
						// Look for a match.
						if ( isset( $hook['function'] ) && isset( $hook['function'][1] ) && $hook['function'][1] === $callback ) {
							// Use the default WordPress system to remove the callback using the correct name.
							remove_filter( $hook_name, $function_key, $priority );
						}
					}
				}
			}
		}
	}

}

$fuzzy_hooks = Fuzzy_Hooks_With_Instance::getInstance();
new Other_Class();
new Fuzzy_Hooks();