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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump('ls'.shell_exec('dd'));
Output for 4.3.0 - 5.3.28, 5.4.0 - 5.4.26, 5.4.41 - 7.1.0
string(2) "ls"
Output for 5.3.29, 5.4.27 - 5.4.40
string(2) "ls" sh: 1: dd: not found