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run code in 150+ php & hhvm versions
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<?php system("/bin/sh -c 'a(){ echo foo };a'");
Output for 4.3.0 - 5.6.21, 7.0.0 - 7.1.0
Output for hhvm-3.10.0 - 3.12.0
Failed to exec: `/bin/sh -c 'a(){ echo foo };a''