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run code in 150+ php & hhvm versions
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<?php exec('uuidgen', $output, $ret);var_dump($output);var_dump($ret);
based on VeL4M
Output for 4.3.0, 5.4.39 - 5.6.28, 7.0.0 - 7.1.0
array(0) { } int(127)
Output for hhvm-3.10.0 - 3.12.0
array(1) { [0]=> string(25) "Failed to exec: `uuidgen'" } int(1)
Output for 4.3.1 - 5.4.38
array(0) { } int(127) sh: 1: uuidgen: not found