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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 - 7.1.7
array(0) { } int(127)
Output for 4.3.1 - 5.4.38
array(0) { } int(127) sh: 1: uuidgen: not found