3v4l.org

run code in 300+ PHP versions simultaneously
<?php function swap($a, $b) { $temp = $a; $a = $b; $b = $a; } $a=10; $b=5; if($a>$b) { swap($a, $b); } for($i=$a; $i<=$b; $i++) { echo $i." "; } ?>
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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
preferences:
228.1 ms | 404 KiB | 330 Q