3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = ['bar' => 'foo']; unset($a['blah']); unset($a['foo']); unset($a['bar']); var_dump($a);
Output for 5.6.0 - 5.6.29, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(0) { }
preferences:
124.76 ms | 1696 KiB | 4 Q