images on the fly
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webmonkey has a cool article about generating images on the fly with PHP’s GD graphics library. but if you’re on a shared server, you may have a hard time convincing the host to do this:
You need to compile PHP with the GD library, the FreeType library, and libjpeg. GD, in turn, requires libpng and zlib. Download those puppydogs from their respective homes, and install them according to their respective documentation.