3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ALL); $array = []; var_dump(empty($array['foo'])); var_dump(isset($array['foo'])); var_dump($array['foo']);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
bool(true) bool(false) Warning: Undefined array key "foo" in /in/4BFuI on line 9 NULL
Output for 5.5.0 - 5.5.38, 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
bool(true) bool(false) Notice: Undefined index: foo in /in/4BFuI on line 9 NULL
preferences:
145.02 ms | 408 KiB | 5 Q