Access parent class private member from child class

access_parent_private_member.php

<?php
/**
 * Access parent class private member from child class
 * @param $class $this|object
 * @param $property string
 * @param $cache bool
 * @return mixed
 */
 
$cacheStorage = [];

function access_parent_private_member($class, $property, $cache = true) {
	$class_name = get_parent_class($class);

	if ($cache && isset($cacheStorage[$class_name], $cacheStorage[$class_name][$property]) && !empty($cacheStorage[$class_name])) {
		return $cacheStorage[$class_name][$property];
	}

	$closure = Closure::bind(function() use ($property) {
		return $this->{$property};
	}, $class, $class_name);

	$value = $closure();
	$cacheStorage[$class_name] = [$property => $value];
	return $value;
};

example.md

Usage:

class ParentClass {
    private $foo = 123;
    
    public function __construct() {}
    
}

$parent = new ParentClass();

class ChildClass extends ParentClass {
    public function __construct() {
         parent::__construct();
    }
}

$child = new ChildClass();

var_dump(access_parent_private_member($child, 'foo'));

Live Example