title: create white image with php
body: <p>I trying create empty white image with php, this s my code</p>
  
  <pre><code>$bg = imagecreatetruecolor(120, 20);
  
  imagejpeg($bg,"test/myimg.jpg",100);
  </code></pre>
  
  <p>but this created black image and I want create white, please tell how to set image for example white color?</p>