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Xdebug is an extension for PHP, and provides a range of features to
improve the PHP development experience.
Step Debugging:
A way to step through your code in your IDE or editor while
the script is executing.
Improvements to PHP's error reporting:
An improved var_dump() function, stack traces for Notices, Warnings,
Errors and Exceptions to highlight the code path to the error.
Tracing:
Writes every function call, with arguments and invocation location
to disk. Optionally also includes every variable assignment and
return value for each function.
Profiling:
Allows you, with the help of visualisation tools, to analyse the
performance of your PHP application and find bottlenecks.
Code Coverage Analysis:
To show which parts of your code base are executed when running
unit tests with PHP Unit.
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