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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(exec('cd ../../ls'));
based on vFBoE
Output for 4.3.0, 5.4.43 - 7.2.0
string(0) ""
Output for 4.3.1 - 5.4.42
string(0) "" sh: 1: cd: can't cd to ../../ls