<?php
    header('Content-Type: image/png');
    
    $image = imagecreate(64, 64);
    
    $bg = imagecolorallocate($image, 255, 0, 255);
    
    $checker = imagecolorallocate($image, 0, 0, 0);
    
    imagefill($image, 0, 0, $bg);
    
    imagefilledrectangle($image, 0, 0, 31, 31, $checker);
    imagefilledrectangle($image, 32, 32, 63, 63, $checker);
    
    imagepng($image);
?>