Ten Security Checks for PHP, Part 2 (O'ReillyNet)
Part two of the O'Reilly article on PHP security checks is available.
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The same global access that makes web apps useful means that you have to keep on top of security. Though it's easy to create sites in PHP, it's not immune to sloppy coding. Clancy Malcolm explains how to recognize and fix five potential security holes with PHP in the second of two articles."