PHP小记(7) - 项目根目录的绝对路径
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进行PHP系统开发时，引入文件是一件很头疼的事，原因在于，文件的引用会出现嵌套，所以在这个文件引用方式正确，在另一个文件却引用不进来。
php的文件引用include和require都采用绝对路径的方式。因此，最好的解决办法是，贯穿整个系统开发都采用完整的绝对路径引入方式。
在项目根目录下的配置文件中定义如下全局变量：
define("PROJECT_ROOT", dirname(__FILE__));那么PROJECT_ROOT就是项目根目录的绝对路径了，在整个系统的文件中都可以采用。
需注意的是，dirname不包括最后的一个斜杠"/"。
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