Defining priority and arguments to Single Post Meta Manager Loader class.

class-single-post-meta-manager-loader.php

<?php
/**
 * This class is based on the loader class from this tutorial;
 * https://code.tutsplus.com/tutorials/object-oriented-programming-in-wordpress-document-the-plugin-ii--cms-21167
 *
 * In this example I have added the ability to define the priority and arguments for actiond and filters.
 */

class Single_Post_Meta_Manager_Loader {
	protected $actions;
	protected $filters;

	public function __construct() {
		$this->actions = array();
		$this->filters = array();
	}

	public function add_action( $hook, $component, $callback, $priority = null, $args = null ) {
		$this->actions = $this->add( $this->actions, $hook, $component, $callback, $priority, $args );
	}

	public function add_filter( $hook, $component, $callback, $priority = null, $args = null ) {
		$this->filters = $this->add( $this->filters, $hook, $component, $callback, $priority, $args );
	}

	private function add( $hooks, $hook, $component, $callback, $priority = null, $args = null ) {
		$hooks[] = array(
			'hook'      	=> $hook,
			'component' 	=> $component,
			'callback'  	=> $callback,
			'priority'	=> $priority,
			'args'		=> $args,
		);

		return $hooks;
	}

	public function run() {
		 foreach ( $this->filters as $hook ) {
			 add_filter( $hook['hook'], array( $hook['component'], $hook['callback'] ), $hook['priority'], $hook['args'] );
		 }

		 foreach ( $this->actions as $hook ) {
			 add_action( $hook['hook'], array( $hook['component'], $hook['callback'] ), $hook['priority'], $hook['args'] );
		 }
	}
}