3v4l.org

run code in 300+ PHP versions simultaneously
<?php $mykey = "\x00" . uniqid(); $var[$mykey] = TRUE; foreach($var as $key => $val) { if ($key === $mykey) { echo 'You got it right'; } else { echo 'You got it wrong'; } }
Output for 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, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.24, 7.3.0 - 7.3.12
You got it right
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Warning: uniqid() expects at least 1 parameter, 0 given in /in/MdfP3 on line 2 You got it right
Output for 4.3.0 - 4.3.2
Warning: uniqid() expects at least 1 parameter, 0 given in /in/MdfP3 on line 2 You got it wrong

preferences:
193.01 ms | 401 KiB | 221 Q