![]() ![]() It is not possible to run Xdebug and PCOV at the same time, but PCOV provides an INI toggle to keep the extension loaded, but the functionality disabled. It does not support path coverage, nor dead-code analysis, but it is the fasted (benchmarks below) extension approach to PHP code coverage. PCOV is a PECL extension designed for code coverage and code coverage alone. This gives a significant performance improvement over the previous version. In contrast to various toggles for Xdebug features, it now only functions in different modes, be it step debugger, profiler, or a code coverage. ![]() Xdebug 3 is not released as a stable version yet, but beta versions are available, and compiles just fine on PHP 8 that already has its API/ABI frozen. Xdebug 3 is the upcoming version of Xdebug. Xdebug also supports path coverage, which means it can detect execution of individual branches in a statement. In code coverage reports, they can help discover snippets that have no code paths leading to them. Xdebug 3 in coverage mode is provides the same code coverage functionality, but it is significantly faster in Xdebug 3. Unlike Xdebug 2 that had toggles for individual features (code coverage, step debugger, and profiler), Xdebug 3 simplifies the configuration and code with only one mode active at a time. Xdebug 3 splits the functionality to "modes". For the benchmark and comparison purposes, Xdebug 2.9.8 and the latest code from master branch are used for the upcoming version 3. Xdebug version 3 is active development, and had its first beta release recently. Xdebug is the most accurate and precise code coverage tool, as it even has custom handling when the Zend/Opcode does not provide enough information to infer accurate code coverage. Due to the complex architecture and rich feature set, Xdebug is often slow, and using Xdebug often results in the tests to run considerably slow.Ĭode Coverage data from Xdebug provides information about dead code (code that will never be executed), and it also supports code path coverage, although it is significantly slower in practice. Xdebug is a mature and actively developed PHP extension with a profiler, step debugger, and a code coverage tool. phpdbg is implemented as a server API, which limits its usefulness, but it provides an easy approach to code coverage without having to install PECL extensions. It has features similar to Xdebug, albeit relatively less adoption in community and IDEs. Phpdbg is a PHP Debugger shipped with PHP itself. PCOV, a recent PHP extension by Joe Watkins aims to be a minimal and fast solution for code coverage, which solves the often slow Xdebug version 2 series. Xdebug, a PHP extension project started back in 2002 by Derick Rethans is the de-facto tool that helps in step debugging, profiling, and of code in code coverage. PHP Code Coverage feature is often provided as part of a bigger tooling the PHP developers would use otherwise. If path coverage is desired, that can be specified from the XML configuration file as well:. Using code coverage data from the tool used (such as PCOV or Xdebug), PHPUnit can generate code coverage reports in various formats that are human-readable and machine-readable for further processing. In PHPUnit 9.x series, Code Coverage can be enabled from the phpunit.xml(.dist) configuration file, with a setup similar to this: It's possible to use this library as an abstraction layer for various code coverage tools. sebastianbergmann/php-code-coverage is the package used by PHPUnit for its code coverage functionality. PHPUnit, the popular PHP Unit Testing framework supports Xdebug, PCOV, and phpdbg for code coverage reports. Some tools can report specific lines that were executed, and some tools can go as far as showing which specific branches of code were executed. ![]() PHPUnit has support various formats to report code coverage, including a simple CLI output option.Ĭode Coverage tools are not perfect. While 100% of code coverage during a test does not mean the application will be bug-free, it is a measurable indication on how thorough the unit tests are.Ĭode Coverage reports can reveal how effective those tests are, and tools such as PHPUnit can generate meaningful reports using the code coverage data. The most common use case is to measure how much of the code base gets executed, and thus "covered" and "tested" during a test. Code Coverage tools help discover which parts of an application get executed during a test. ![]()
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