3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr=array(1100,3150,4430,4430,5170,7450,7450,7450,8230); $out = array($arr[0]); for ($i = 1; $i < count($arr); $i++) { $out[$i] = $out[$i-1] + $arr[$i]; } $arr = array_combine($out, $arr); print_r($arr);

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26.71 ms | 405 KiB | 5 Q