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run code in 200+ php & hhvm versions
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<?php $value = true; function abort() { var_dump('in abort'); } $value ?? abort();
Output for hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
Output for 5.6.30
Parse error: syntax error, unexpected '?' in /in/AbetF on line 10
Process exited with code 255.