PHP/Graphics Image/imagefilledrectangle

Changing colors with a loop

 
<?php
    $image = imagecreate(400,300);
    $gold = imagecolorallocate($image, 255, 240, 00);
    $white = imagecolorallocate($image, 255, 255, 255);
    $color = $white;
    for ($i = 400, $j = 300; $i > 0; $i -= 4, $j -= 3) {
            if ($color =  = $white) {
                    $color = $gold;
            } else {
                    $color = $white;
            }
            imagefilledrectangle($image, 400 - $i, 300 - $j, $i, $j, $color);
    }
    imagepng($image);
    imagedestroy($image);
?>

Creating and Applying Different Shapes and Patterns

 
<?php
    $animage = imagecreate (500, 500);
    $white = imagecolorallocate ($animage, 255, 255, 255);
    $black = imagecolorallocate ($animage, 0, 0, 0);
    imagefilledrectangle ($animage, 0, 0, 500, 500, $black);
    $blue = imagecolorallocate ($animage, 0, 0, 255);
    $green = imagecolorallocate ($animage, 0, 255, 0);
    $myvalues = array ("1","2","3","4","5","6");
    $barwidth = (int) (500 / ((count ($myvalues) * 2)+ 1));
    $barheightpernum = (int) (500 / 10);
       imagefilledrectangle ($animage, 1, 300,498, $black);
      
    imagepng ($animage);
    header ("Content-type: image/png");
    imagedestroy ($animage);
?>

Draw a rectangle

 
<?php
    $image = imagecreate(400,300);
    $white = imagecolorallocate($image, 255, 255, 255);
    imagefilledrectangle($image, 10, 10, 390, 290, $white);
?>