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run code in 200+ php & hhvm versions
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<?php $bar = ['basdf' =>'biz']; $foo = $bar['fus'] ?? $bar['baz']; var_dump($foo);
based on jCSVs
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Notice: Undefined index: baz in /in/KnhrE on line 4 NULL
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/KnhrE on line 4
Process exited with code 255.