3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = null $b = $a ?? clone $a
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16, 7.0.0
Parse error: syntax error, unexpected '$b' (T_VARIABLE) in /in/FRbqr on line 4
Process exited with code 255.
preferences:
173.91 ms | 1395 KiB | 24 Q