How to: Debugging and Profiling
*Libraries and tools for debugging errors and profiling code.*

* [APM](https://pecl.php.net/package/APM) - Monitoring extension collecting errors and statistics into SQLite/MySQL/StatsD.
* [Barbushin PHP Console](https://github.com/barbushin/php-console) - Another web debugging console using Google Chrome.
* [Kint](https://github.com/kint-php/kint) - A debugging and profiling tool.
* [Metrics](https://github.com/beberlei/metrics) - A simple metrics API library.
* [PCOV](https://github.com/krakjoe/pcov) - A self-contained code coverage compatible driver.
* [PHP Console](https://github.com/Seldaek/php-console) - A web debugging console.
* [PHP Debug Bar](http://phpdebugbar.com/) - A debugging toolbar.
* [PHPBench](https://github.com/phpbench/phpbench) - A benchmarking Framework.
* [PHPSpy](https://github.com/adsr/phpspy) - A low-overhead sampling profiler.
* [Symfony VarDumper](https://github.com/symfony/var-dumper) - A variable dumper component.
* [Tracy](https://github.com/nette/tracy) - A simple error detection, logging and time measuring library.
* [Whoops](https://github.com/filp/whoops) - A pretty error-handling library.
* [xDebug](https://github.com/xdebug/xdebug) - A debug and profile tool for PHP.
* [XHProf](https://github.com/phacility/xhprof) - A profiling tool originally developed by Facebook.
* [Z-Ray](https://www.zend.com/products/z-ray) - A debug and profile tool for Zend Server.