Master Your Coding Skills

<?php
function solve($arr) {
    // Find maximum subarray sum
    $maxSum = PHP_INT_MIN;
    $currentSum = 0;
    
    foreach ($arr as $num) {
        $currentSum = max($num, $currentSum + $num);
        $maxSum = max($maxSum, $currentSum);
    }
    
    return $maxSum;
}
?>