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run code in 200+ php & hhvm versions
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<?php $a = $b ?? 99; var_dump($a);
based on nhV00
Output for 7.0.0 - 7.2.0
int(99)
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/fJEmb on line 5
Process exited with code 255.