3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1,2,1,3,2,1,3,2,1,3,2,1,2,3,1,2,3); foreach($a as $k => $v) { echo "Found $v at index $k\n"; }
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, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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
Found 1 at index 0 Found 2 at index 1 Found 1 at index 2 Found 3 at index 3 Found 2 at index 4 Found 1 at index 5 Found 3 at index 6 Found 2 at index 7 Found 1 at index 8 Found 3 at index 9 Found 2 at index 10 Found 1 at index 11 Found 2 at index 12 Found 3 at index 13 Found 1 at index 14 Found 2 at index 15 Found 3 at index 16
preferences:
256.17 ms | 406 KiB | 317 Q