3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = array(0 => 1, 2 => 3, 4 => 5, 6 => 7, 8 => 9); foreach (array_keys($x) as $key => $value) { echo $key . "->". $value."\n"; } echo next($x)."\n"; echo next($x)."\n"; $y = $x; echo next($y)."\n"; echo next($y)."\n"; reset($y); echo next($x)."\n"; echo next($y)."\n";

preferences:
56.2 ms | 402 KiB | 5 Q