3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = null; $b = 'test'; $c = "tset"; $d = 123; $e = '123'; $f = "123"; $g = ''; $h = ""; $i = false; echo $g ?? true : false;
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected '?' in /in/LqaaM on line 13
Process exited with code 255.
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168.53 ms | 1395 KiB | 22 Q