3v4l.org

run code in 300+ PHP versions simultaneously
<?php $lines = array ( ['a','b','c','d'], ['e','f','g'], ['h','i'] ); $continue = true; while($continue) { $continue = false; foreach($lines as $key => $line) { if(!empty($line)) { echo array_shift($line); $lines[$key] = $line; $continue = true; } } }
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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preferences:
142.7 ms | 404 KiB | 192 Q