3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20); while(count($array) > 0){ $first = array_shift($array); foreach($array as $value){ $result[] = $first + $value; } } var_dump($result);

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36.91 ms | 402 KiB | 5 Q