3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = $y = 1; $z = 0; $t = 3; $flag = null; if($x){ if($y){ $flag = $y.': y'; } else { if($t){ $flag .= $t.': t'; } } if(!$z){ $flag .= $z.': z'; } } if($flag){ echo $flag; } else { echo 'flag is not set.'; }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
1: y0: z
preferences:
110.15 ms | 1474 KiB | 4 Q