如何在给定范围内的多维数组中搜索最大值

Question

I have a multidimensional $array that has a lot of various values. I am trying to get the maximum value in a given range in this case lets say the maximum value within x1,y0 and x2,y7, thus the result would be 6 using the data below.

It seems like a common problem for searching within coordinates in multidimensional array... but I cant find a simple solution and everything that I try to do seems to be rather extensive in the coding. I was wondering if there is a function that would allow me to search in this array using my criteria in an efficient way.

$array[0][0] = 1;
$array[0][1] = 10;
$array[0][3] = 3;
$array[1[0] = 1;
$array[1][1] = 1;
$array[2][5] = 6;

Answer 1

$array[0][0] = 1;
$array[0][1] = 10;
$array[0][3] = 3;
$array[1][0] = 1;
$array[1][1] = 1;
$array[2][5] = 6;

$max = false;
$x1 = 1; $x2 = 2;
$y1 = 0; $y2 = 7;

foreach($array as $x => $y_vals) {    
    if($x < $x1 || $x > $x2)
        continue;

    foreach($y_vals as $y => $val) {
        if($y < $y1 || $y > $y2)
            continue;

        if(false === $max || $max < $val)
            $max = $val;
    }
}

print $max; //6