Find max

findmax.php

<?php
function findMax(array $input, $range) {
    $curSum = 0;

    for($i=0;$i<count($input);$i++) {
        $subArr = array_slice($input, $i, $range);

        $sum = 0;
        foreach($subArr as $arr) {
            $sum += $arr;
        }

        if($curSum < $sum) {
            $curSum = $sum;
        }
    }

    return $curSum;
}

$input = array(1,2,1,3,4,5);
var_dump(findMax($input,2));
?>