How to get an array of fixed size squares from a bigger square?-CodePudding

I’m trying to get the array of fixed size squares from a bigger square. For example:

I have coordinates of a square:

$x1 = 1;
$x2 = 100;
$y1 = 1;
$y2 = 100;
$smallerSquareSide = 10;

What I expect as result:

$res = [[1,10,1,10],[11,20,1,10],[21,30,1,10],…]

But I have no idea how to do that correctly.

P.S. there may be empty spaces around the borders because the numbers might not match

CodePudding user response：

this should work (format of output: res=[square1, square2, square3, ...], squareN=[x1, x2, y1, y2])

$x1 = 1;
$x2 = 100;
$y1 = 1;
$y2 = 100;
$smallerSquareSide = 10;

$res = [];
for($i=$y1; $i ($smallerSquareSide-1)<=$y2; $i =$smallerSquareSide){  // loop y
    for($j=$x1; $j ($smallerSquareSide-1)<=$x2; $j =$smallerSquareSide){  // loop x
        // add next square coords -> [$j, $j ($smallerSquareSide-1), $i, $i ($smallerSquareSide-1)]
        array_push($res, [$j, $j ($smallerSquareSide-1), $i, $i ($smallerSquareSide-1)]);
    }
}