3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = null; $b = false; $c $b ?: '1'; $d = $a ?? '2'; echo $c; echo $d;
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected '$b' (T_VARIABLE) in /in/mLtqs on line 4
Process exited with code 255.
preferences:
190.44 ms | 1395 KiB | 67 Q