[WordPress] Registering WordPress Hooks Using Another Class

00-plugins-loaded.php

<?php

add_action( 'plugins_loaded', 'acme_start' );
/**
 * Start the machine.
 * https://www.youtube.com/watch?v=ysoMOefPyRs
 */
function acme_start() {
	$plugin = new AcmeColumn();
}

01-acme-column.php

<?php

class AcmeColumn {
  
	private $registry;
  
	public function __construct( $registry ) {
		$this->registry = $registry;
	}
  
	public function start() {
		$registry->add_hook( 'filter', 'manage_edit-page_columns', $this, 'add_page_column' );
	}
  
	public function add_page_column( $page_columns ) {

		$page_columns['template'] = 'Acme Column';
		return $page_columns;
	} 
}
  

01-startup-process.php

<?php

add_action( 'plugins_loaded', 'acme_start' );
/**
 * Start the machine.
 * https://www.youtube.com/watch?v=ysoMOefPyRs
 */
function acme_start() {
  
  $registry    = new HookRegistry();
  
  $acme_column = new AcmeColumn( $registry );
  $acme_column->start();
}

02-hook-registry.php

<?php

class HookRegistry {
 
  public add_hook( $type, $name, $object, $method ) {
    
    $type = strtolower( $type );
    if ( 'filter' !== $type || 'action' !== $type ) {
      return new WP_Error( '1', 'No proper hook type defined.' );
    }
  }
  
  private function add_filter( $name, $object, $method ) {
    add_filter( $name, array( $object, $method ) );
  }
  
  private function add_action( $name, $object, $method ) {
    add_action( $name, array( $object, $method ) );
  }
}

03-hook-registry-improved.php

<?php

class HookRegistry {
 
  private $registry;
  
  public function __construct() {
    $this->registery = array(); 
  }
  
  public add_hook( $id, $type, $name, $object, $method ) {
    
    $type = strtolower( $type );
    if ( 'filter' !== $type || 'action' !== $type ) {
      return new WP_Error( '1', 'No proper hook type defined.' );
    }
    
    if ( 'filter' === $type ) {
      $this->add_filter( $name, $object, $method );
    } else {
      $this->add_action( $name, $object, $method );
    }
    
    $hook_info = array(
      $type,
      $name,
      $object,
      $method,
    );
    $this->registry[ $id ] = $hook_info;
  }
  
  private function add_filter( $name, $object, $method ) {
    add_filter( $name, array( $object, $method ) );
  }
  
  private function add_action( $name, $object, $method ) {
    add_action( $name, array( $object, $method ) );
  }
}