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);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [1100] => 1100 [4250] => 3150 [8680] => 4430 [13110] => 4430 [18280] => 5170 [25730] => 7450 [33180] => 7450 [40630] => 7450 [48860] => 8230 )
preferences:
139.8 ms | 408 KiB | 5 Q