creating signatures with gd and php

Does any one know good resource site that outlines how to construct user signature with use o开发者_如何学Gof PHP and GD library? Not that much just some sort of custom font and custom background image which is preset by the user upon uploading.

Example

Thank you in advance

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http://scriptplayground.com/tutorials/php/Text-On-Image/

Notice how ImageTTFText() is being called multiple times: once for the text, then once for the shadow. To make your example sig image, you'll need to call ImageTTFText() for every bit of text you want to add on top of the image using coordinates and colors of your choosing.