What is Xdebug?
Xdebug is an extension for PHP that serves as a debugger and profiler tool for developers. It is designed to enhance the PHP development experience by offering various features that assist in understanding and optimizing application code. Xdebug helps developers identify issues and improve the performance of their PHP applications. Developers use Xdebug for step debugging, which allows them to execute code line by line within their IDE or editor. It also provides improved error reporting, including stack traces for various error types and an enhanced `var_dump()` function. Additionally, Xdebug offers code profiling to analyze application performance and code coverage analysis for unit testing.