i'm tring to create PNG image with background consisting of squares in two colors, the squares is repeated horizontally or vertically as in the picture.

This is my code :

<?php
$maxwert = 300;
$size = 20;
$img = imagecreatetruecolor($maxwert, $maxwert);
imagecolorallocate($img, 0, 0, 0);

   for($y=0;$y<$maxwert;$y  = $size){
     for($x=0;$x<$maxwert;$x =$size){
      $r = rand(0,255);
      $g = rand(0,255);
      $b = rand(0,255);
      $color = imagecolorallocate($img, $r, $g, $b);
     
      imagefilledrectangle ($img, $x, $y, $x $size ,$y $size, $color);
    
     }
   }                 
// Save the image
imagepng($img, 'imagefilledrectangle.png');
imagedestroy($img);
?>

My output:

CodePudding user response：

Create two colours outside the loop and then cycle one then the other

<?php
$maxwert = 300;
$size = 20;
$img = imagecreatetruecolor($maxwert, $maxwert);
$colors = [
    imagecolorallocate($img, rand(0,255), rand(0,255) rand(0,255)),
    imagecolorallocate($img, rand(0,255), rand(0,255) rand(0,255))
];


for($y=0;$y<$maxwert;$y  = $size){
    for($x=0;$x<$maxwert;$x =$size){
        imagefilledrectangle ($img, $x, $y, $x $size ,$y $size, $colors[(($x/$size)%2 ($y/$size))%2]);    
    }
}                
// Save the image
imagepng($img, 'imagefilledrectangle.png');
imagedestroy($img);
?>