How to generate php background image

How to generate a php background image:

<?php
$image = imagecreatetruecolor($imgWidth, $imgHeight);
$white = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $white);

The above is the sample code of how to generate a php background image. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!