Installing php54-xdebug on OSX.

In order to verify code coverage for PHPUnit test, it must need to install the `php54-xdebug`. In this tutorial, the Homebrew is used to install it.

First of all, we use the brew tap which allows you to add more Github repos to the list of formulas 
*$ brew tap homebrew/dupes*

Next, it's time to install the php54-xdebug! This should take for a while to install its dependencies. 

$ brew install php54-xdebug 

(Optional) If there is an error about the permission - cannot write  /usr/local/include, you can give it a permission by using:

$ sudo chown -R $USER /usr/local/include

Finally, add the following lines into `php.ini`
*[XDebug]
; Only Zend OR (!) XDebug
zend_extension=/usr/lib/php/extensions/no-debug-non-zts-20100525/xdebug.so
; XAMPP and XAMPP Lite 1.7.0 and later come with a bundled xdebug at /php/ext/php_xdebug.dll,without a version number.
xdebug.remote_enable=1
xdebug.remote_host=127.0.0.1
xdebug.remote_port=9000
; Port number must match debugger port number in NetBeans IDE Tools > Options > PHP
xdebug.remote_handler=dbgp
xdebug.var_display_max_depth = 10
xdebug.var_display_max_data = 2048* Note:  php54-xdebug is used to install PHP5.4. So, you can simply change the version as you need.