3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array('a' => '…', 'b' => '…', 'c' => '…', 'd' => '…', 'e' => '…', 'f' => '…'); foreach ($array as $key => $val){ echo "current key: $key, next key: ".key(($array))."<br>"; }

preferences:
61.06 ms | 402 KiB | 5 Q