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Phan is a static analyzer for PHP. Phan prefers to avoid false positives and attempts to prove incorrectness rather than correctness. Phan looks for common issues and will verify type compatibility on various operations when type information is available or can be deduced. Phan has a good (but not comprehensive) understanding of flow control and can track values in a few use cases (e.g. arrays, integers, and strings). With Phan installed, you'll want to create a .phan/config.php file in your...