3v4l.org

run code in 300+ PHP versions simultaneously
<?php $dataset = array("a" => "one", "b" => "two"); reset($dataset); while ($a = current($dataset)) { var_dump($a); next($dataset); if ($a == "one") { $dataset[$a] = "three"; } } var_dump($dataset);

preferences:
55.2 ms | 402 KiB | 5 Q