2d-array.php

<?php
 // https://www.hackerrank.com/challenges/2d-array/problem

function hourglassSum($arr) {
    $max = -63;
    for ($i = 0; $i < 4; $i++) {
        for ($j = 0; $j < 4; $j++) {
            $sum = $arr[$i][$j] +
                $arr[$i][$j + 1] +
                $arr[$i][$j + 2] +
                $arr[$i + 1][$j + 1] +
                $arr[$i + 2][$j] +
                $arr[$i + 2][$j + 1] +
                $arr[$i + 2][$j + 2];
                
            $max = max($sum, $max);
        }
    }

    return $max;
}

$fptr = fopen(getenv("OUTPUT_PATH"), "w");

$stdin = fopen("php://stdin", "r");

$arr = array();

for ($i = 0; $i < 6; $i++) {
    fscanf($stdin, "%[^\n]", $arr_temp);
    $arr[] = array_map('intval', preg_split('/ /', $arr_temp, -1, PREG_SPLIT_NO_EMPTY));
}

$result = hourglassSum($arr);

fwrite($fptr, $result . "\n");

fclose($stdin);
fclose($fptr);