PHPUnit is the de-facto standard for unit testing in PHP projects. It provides both a framework that makes the writing of tests easy as well as the functionality to easily run the tests and analyse their results.
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PHP_CodeCoverage is a library that provides collection, processing, and rendering functionality for PHP code coverage information.
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ext/test_helpers is an extension for the PHP Interpreter to ease testing of PHP code.
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phpcpd is a Copy/Paste Detector (CPD) for PHP code. It scans a PHP project for duplicated code.
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phpdcd is a Dead Code Detector (DCD) for PHP code. It scans a PHP project for code that is no longer used.
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phploc is a tool for quickly measuring the size of a PHP project.
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bytekit-cli provides a command-line tool that leverages the Bytekit extension to perform common code analysis tasks on the PHP bytecode level.
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Object_Freezer is a library that provides the low-level functionality to store ("freeze") and retrieve ("thaw") PHP objects from an object store.
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PHP_TokenStream is a wrapper around PHP's tokenizer extension.
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File_Iterator is a FilterIterator implementation to conveniently filter files.
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