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Creating a CAPTCHA in PHP with GD

A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a system designed to test if input is originating from a human or a computer. This tutorial will explain how to make your own CAPTCHA using PHP and the bundled ...
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Math Captcha image validation

With all the Captcha decoders these days, its impossible to build a solid Captcha image validator with a string. The solution? Have a captcha that asks simple math addition questions! Decoders are not very good at breaking these. This tutorial ...
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Create Thumbnail Images using PHP

This tutorial will describe how to create thumbnail images on the fly using PHP. Furthermore you will learn how to process a whole folder of images and create their thumbnails. Since this requires the GD library, you will need an installation of PHP ...
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PHP Create Image Thumbnail

In this tutorial you will learn how to generate thumbnails from form uploaded images using GD php image library. The image ratio is maintained, so the thumbnail images will not be deformed. An image verification is performed before uploading and the ...
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Creating an Image Gallery

the goal of this tutorial is to give the reader an idea of how to construct a basic/dynamic image gallery from start to finish, not to imply that this is the only way, or even the best way to build a gallery; just a simple approach without all the be...
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An intro to using the GD image library with PHP

A brief introduction to the world of image manipulation in PHP using the GD library. This tutorial will guide you through creating a clock that will display the current time.
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Dynamic Image Generation with PHP

PHP lets you do a lot more than simply generating HTML content, it is also a great tool to dynamically generate images on-the-fly. For example, you can create buttons with text from a database, create grapical displays of statistics from log files, a...
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Serving Graphical Web Page Counters from a PHP Script

This tutorial is intended for PHP programmers interested in learning how to apply PHP''s GD image manipulation support. Readers interested in learning how to access a MySQL database from PHP, and/or define a PHP function will also benefit from t...
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Interactive Maps with PHP

This tutorial shows you how to create an interactive image maps using PHP and the GD library. It explains a method to zoom a portion of an image by using PHP and gif files.
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