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+xdebug (A PHP extension for debugging PHP scripts)
+
+The Xdebug extension helps you debugging your script by providing a
+lot of valuable debug information. The debug information that Xdebug
+can provide includes the following: stack traces and function traces
+in error messages, memory allocation and protection for infinite
+recursions. Xdebug also provides profiling information for PHP,
+scripts, code coverage analysis and capabilities to debug PHP scripts
+interactively with a debug client.
+
+Once you've installed xdebug, uncomment the following line in
+/etc/php.d/xdebug.ini:
+
+; zend_extension = "/usr/lib/php/extensions/xdebug.so"
+
+Restart your webserver if you're using php with it, and as a
+recomendation from xdebug's README: "Write a PHP page that calls
+"phpinfo();" Load it in a browser and look for the info on the xdebug
+module. If you see it, you have been successful!"
+
+Note that some of xdebug's functionality may be dependent on php core
+configuration settings.