<?php
// Everything you enter here will be executed by our servers. Try it!
$year = array(2011, 2011, 2011, 2012, 2012, 2013, 2013, 2013);
$profit = array(23.42, 253.23, 54.5, 433.23, 53.2, 11.4, 45.5, 532.1);
$sums = array();
for ($i = 0; $i < count($year); $i++) {
if (isset($sums[$year[$i]])) {
$sums[$year[$i]] += $profit[$i];
} else {
$sums[$year[$i]] = $profit[$i];
}
}
print_r($sums);
preferences:
33.69 ms | 402 KiB | 5 Q