Merge branch 'PHP-7.2'

* PHP-7.2:
  Fix #76300 - Dont attempt to change visibility of a parent private

Author: smalyshev

ext/standard/tests/serialize/bug76300.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Bug #76300: Unserialize of extended protected member broken
+--FILE--
+<?php
+class Base {
+	private $id;
+	public function __construct($id)
+	{
+		$this->id = $id;
+	}
+}
+class Derived extends Base {
+	protected $id;
+	public function __construct($id)
+	{
+		parent::__construct($id + 20);
+		$this->id = $id;
+	}
+}
+$a = new Derived(44);
+$s = serialize($a);
+$u = unserialize($s);
+print_r($u);
+--EXPECT--
+Derived Object
+(
+    [id:protected] => 44
+    [id:Base:private] => 64
+)