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Configuring Xdebug is split into two parts:
First check if this extension is already installed. Create a new file with the content <?php phpinfo(); ?>, save it in your webfolder (f.e. C:\xampp\htdocs\phpinfo.php) and call it using your browser (f.e. http://localhost/phpinfo.php). The command PHPINFO will show you all information about installed plugins, their configuration and so on. If you see a headline called Xdebug, it is already downloaded and enabled.
To get the extension for a Windows-System, you have to download the DLL-file from http://xdebug.org/download.php that fit's to your PHP version, move it into the ext folder of your PHP-installation. If the file php_xdebug.dll exists, leave it there. It's most likely the right version, just that it's not enabled. This was f.e. the case for the last XAMPP package I used.
On windows-systems you most likely just have one php.ini file for all configuration whereas on several Linux distributions you have a directory called conf.d in addition. If you have installed Xdebug on a Linux based system, you'll probably find a file xdebug.ini in there. Use this file instead if you have it (just not to mess-up the main config-file).
You enable the plugin by adding (or uncommenting) the following line to your config-file:
; Example for XAMPP zend_extension = "\xampp\php\ext\php_xdebug.dll" ; Example on Mac OS X for XAMPP zend_extension="/Applications/XAMPP/xamppfiles/lib/php/php-5.3.1/extensions/no-debug-non-zts-20090626/xdebug.so"
Please make sure you use zend_extension instead of extension which (not as extension) requires the full path to the extension-file.
Please also read this introduction for configuration-details: http://xdebug.org/docs/remote
Here is an example of the configuration I use and some comments around that:
; location of my configuration-file zend_extension=/usr/lib/php5/20090626/xdebug.so ; Enables colors if you use xdebug on the console xdebug.cli_color=1 ; Enable profiler by a trigger (f.e. cookie or GET-param) xdebug.profiler_enable_trigger=1 xdebug.profiler_output_dir=/var/www/log/ ; Debugger will try to connect back to the machine sending the HTTP-Request xdebug.remote_connect_back=1 ; Enables the debugger xdebug.remote_enable=1
If your IDE is not listed on http://xdebug.org/docs/remote#clients, you'll probably find a tutorial in the manual of your IDE. Feel free to add helpful tutorials here.