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run code in 150+ php & hhvm versions
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<?php echo syscall("ls"); function syscall($command){ $result = ""; if ($proc = popen("($command)2>&1","r")){ while (!feof($proc)) $result .= fgets($proc, 1000); pclose($proc); return $result; } } ?>
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
Output for hhvm-3.10.0 - 3.12.0
Failed to exec: `(ls)2>&1'