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run code in 150+ php & hhvm versions
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<?php passthru('help /',$resultat); var_dump($resultat);
based on 75Uk1
Output for 4.3.0, 5.4.39 - 7.1.0
int(127)
Output for 4.3.1 - 5.4.38
int(127) sh: 1: help: not found