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run code in 200+ php & hhvm versions
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<?php $foo; $bar; $baz; $var = 2; echo($foo ?? $bar ?? $baz ?? $var); echo((isset($foo) && $foo !== null) ? $foo : ((isset($bar) && $bar !== null) ? $bar : ((isset($baz) && $baz !== null) ? $baz : $var)));
based on GVIgW
Output for 7.0.0 - 7.3.0rc4
22
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/2j7Z7 on line 6
Process exited with code 255.