PHP Warning: Xdebug MUST be loaded as a Zend extension in Unknown on line 0

andy@AndyMacBookPro:~$ php -v
PHP Warning:  Xdebug MUST be loaded as a Zend extension in Unknown on line 0
PHP 5.4.30 (cli) (built: Jul 29 2014 23:43:29)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

编辑php.ini

sudo vim /private/php.ini

将：

extension=/usr/local/Cellar/php54-xdebug/2.2.5/xdebug.so

修改为：

zend_extension=/usr/local/Cellar/php54-xdebug/2.2.5/xdebug.so

然后我们再看下，就好了：

andy@AndyMacBookPro:/private/etc$ php -v
PHP 5.4.30 (cli) (built: Jul 29 2014 23:43:29)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
    with Xdebug v2.2.5, Copyright (c) 2002-2014, by Derick Rethans
andy@AndyMacBookPro:/private/etc$

关于更多：http://blog.163.com/lgh_2002/blog/static/440175262010910103342213/

zend_extension加载php扩展时需用全路径，而extension加载时可以用相对extension_dir的路径。