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<?php eval(base64_decode(base64_encode('var_dump(system("/bin/ls /etc"));')));
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
string(0) ""
Output for hhvm-3.10.0 - 3.13.2
Failed to exec: `/bin/ls /etc' string(30) "Failed to exec: `/bin/ls /etc'"