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run code in 200+ php & hhvm versions
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<?php system('uuidgen', $output);var_dump($output);
based on fH5rE
Output for 4.3.0, 5.4.45 - 7.2.0
int(127)
Output for 4.3.1 - 5.4.44
int(127) sh: 1: uuidgen: not found