3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = (array)(object)['a', 'b']; var_dump(array_keys($a));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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
array(2) { [0]=> int(0) [1]=> int(1) }
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/EJfcE on line 2
Process exited with code 255.
preferences:
196.7 ms | 401 KiB | 334 Q