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The authors describe their experience in using abstract interpretation to analyze applications written in PHP. Their work focuses on reconstructing type information from mostly un-annotated code. They present the abstract domain of their analysis, focusing on the features that improve analysis precision. They have implemented their approach as a tool that supports the full specification of PHP 5. They describe several bugs that they were able to find in deployed web applications. PHP is a very popular scripting language. PHP scripts are behind many web sites, including wikis, content management systems, and social networking web sites.
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