无法在 Mac 上升级 PHP

我已经尝试了在Mac上升级PHP的所有解决方案，现在按照本教程进行操作：http://php-osx.liip.ch/。我还在我的~/.profile中编写了export PATH=/usr/local/php5/bin：$PATH。

现在它看起来像这样：

# MacPorts Installer addition on 2012-10-24_at_12:03:59: adding an appropriate PATH variable for use with MacPorts.
#export PATH=/opt/local/bin:/opt/local/sbin:$PATH
export PATH=/usr/local/php5/bin:$PATH
# Finished adapting your PATH environment variable for use with MacPorts.

但是当我做"php -v"时，它仍然向我显示：

PHP 5.3.15 with Suhosin-Patch (cli) (built: Jul 31 2012 14:49:18)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

什么时候应该说

PHP 5.5.0 (cli) (built: Jun 21 2013 13:11:59)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.5.0-dev, Copyright (c) 1998-2013 Zend Technologies
    with Xdebug v2.2.2, Copyright (c) 2002-2013, by Derick Rethans

请帮忙，我已经尝试了一切。