3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "1234567890a"; var_dump($a["010"], isset($a["010"]), isset($a["10"]));// true
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
string(1) "a" bool(true) bool(true)
preferences:
143.03 ms | 404 KiB | 204 Q