Question1Toptal

Question1Toptal.php

<?php
function solution($K, $L, $M, $N, $P, $Q, $R, $S) {
	//get inputs to check intersection
    $leftSide = max($K, $P); 
    $rightSide = min($M, $R); 
    $bottomSide = max($L, $Q); 
    $topSide = min($N, $S); 

    //the area of the sum of the rectangles
    $sum =  (($M - $K) * ($N - $L)) + (($R - $P) * ($S - $Q));

    //case the rectangles interserc should remove it
    if ($leftSide < $rightSide && $bottomSide < $topSide) {
    	$intersection = ($rightSide - $leftSide) * ($topSide - $bottomSide);
        $sum = $sum - $intersection;
    }

    //sum exceeds
    if ($sum >= 2147483647) {
    	return -1;
    }

    return $sum;
}

echo solution(-4, 1, 2, 6, 0, -1, 4, 3);
?>