This article or section is incomplete, which means it may be lacking information. You are welcome to assist in its completion by editing it as well. If this article or section
Configuring Xdebug is spitted 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.
On a linux-system it depends on your distribution. Most of the distribution have packages ready that you can just download and install right-away. An example is Debian (or Ubunut). The package there is called php5-xdebug. This command will download and enable the plugin.
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 Linux Debian zend_extension=/usr/lib/php5/20090626/xdebug.so ; 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.