3v4l.org

run code in 300+ PHP versions simultaneously
<?php /** * Created by Caolei. * QQ: 21513794 * Date: 13-12-31 * Time: 下午6:27 */ $arr['a']['b']['c'] = 'abcdedg'; var_dump(isset($arr['a']['b']['c']['d']));
Output for 5.0.0 - 5.0.2, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
bool(true)

preferences:
193.21 ms | 402 KiB | 373 Q