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run code in 200+ php & hhvm versions
Bugs & Features
<?php system("printf");
Output for 5.4.1 - 5.4.2, 5.4.41 - 7.2.0
Output for 5.3.13 - 5.3.29, 5.4.3 - 5.4.11, 5.4.13 - 5.4.40
sh: 1: printf: usage: printf format [arg ...]
Output for 5.4.12

Process exited with code 137.