Joomla - doesnt work on php 5.6

If you have joomla on php 5.6 and browser shows you error 500 put this to .htaccess file

php_flag xcache.cacher Off
php_flag xcache.size 0
php_flag xcache.stat On

and replace in /libraries/vendor/autoload.php

require_once __DIR__ . '/composer' . '/autoload_real.php';

by

require_once dirname(__FILE__) . '/composer' . '/autoload_real.php';