3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array( 'a' => 'A', 'b' => 'B', 'c' => 'C'); var_dump($arr); foreach ($arr as &$val) { if ($val == 'B') { unset($val); } } var_dump($arr);

preferences:
37.46 ms | 402 KiB | 5 Q