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run code in 150+ php & hhvm versions
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<?php //DateTime with option DateTimeZone??? $date = exec('ls'); var_dump($date);
based on JiZIc
Output for 4.3.0, 5.4.45 - 7.1.0
string(0) ""
Output for 4.3.1 - 5.4.44
string(0) "" sh: 1: ls: not found