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✏️ Editing: CMB2_Hookup_Base.php

<?php
/**
 * Base class for hooking CMB2 into WordPress.
 *
 * @since  2.2.0
 *
 * @category  WordPress_Plugin
 * @package   CMB2
 * @author    CMB2 team
 * @license   GPL-2.0+
 * @link      https://cmb2.io
 *
 * @property-read string $object_type
 * @property-read CMB2   $cmb
 */
abstract class CMB2_Hookup_Base {

/**
	 * @var   CMB2 object
	 * @since 2.0.2
	 */
	protected $cmb;

/**
	 * The object type we are performing the hookup for
	 *
	 * @var   string
	 * @since 2.0.9
	 */
	protected $object_type = 'post';

/**
	 * A functionalized constructor, used for the hookup action callbacks.
	 *
	 * @since  2.2.6
	 *
	 * @param  CMB2 $cmb The CMB2 object to hookup
	 *
	 * @return CMB2_Hookup_Base $hookup The hookup object.
	 */
	public static function maybe_init_and_hookup( CMB2 $cmb ) {
		throw new Exception( sprintf( esc_html__( '%1$s should be implemented by the extended class.', 'cmb2' ), __FUNCTION__ ) );
	}

/**
	 * Constructor
	 *
	 * @since 2.0.0
	 * @param CMB2 $cmb The CMB2 object to hookup
	 */
	public function __construct( CMB2 $cmb ) {
		$this->cmb = $cmb;
		$this->object_type = $this->cmb->mb_object_type();
	}

abstract public function universal_hooks();

/**
	 * Ensures WordPress hook only gets fired once per object.
	 *
	 * @since  2.0.0
	 * @param string   $action        The name of the filter to hook the $hook callback to.
	 * @param callback $hook          The callback to be run when the filter is applied.
	 * @param integer  $priority      Order the functions are executed
	 * @param int      $accepted_args The number of arguments the function accepts.
	 */
	public function once( $action, $hook, $priority = 10, $accepted_args = 1 ) {
		static $hooks_completed = array();

$args = func_get_args();

// Get object hash.. This bypasses issues with serializing closures.
		if ( is_object( $hook ) ) {
			$args[1] = spl_object_hash( $args[1] );
		} elseif ( is_array( $hook ) && is_object( $hook[0] ) ) {
			$args[1][0] = spl_object_hash( $hook[0] );
		}

$key = md5( serialize( $args ) );

if ( ! isset( $hooks_completed[ $key ] ) ) {
			$hooks_completed[ $key ] = 1;
			add_filter( $action, $hook, $priority, $accepted_args );
		}
	}

/**
	 * Magic getter for our object.
	 *
	 * @param string $field
	 * @throws Exception Throws an exception if the field is invalid.
	 * @return mixed
	 */
	public function __get( $field ) {
		switch ( $field ) {
			case 'object_type':
			case 'cmb':
				return $this->{$field};
			default:
				throw new Exception( sprintf( esc_html__( 'Invalid %1$s property: %2$s', 'cmb2' ), __CLASS__, $field ) );
		}
	}
}

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