3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = range('a', 'z'); echo next($a), PHP_EOL, current($a), PHP_EOL; unset($a[current($a)]); echo current($a), PHP_EOL, key($a), PHP_EOL;;

preferences:
47.17 ms | 402 KiB | 5 Q