php 继承包含父类的问题
子类包含父类时，我使用一个常量 include_once(_CLASS_PATH_.'父类.php')
子类在程序运行时被其他php页面引用，该页面包含有clss_path这个常量
问题是
如果我直接打开子类php的文件，会报错，问题我知道，是因为class_path没有赋值
所以在这里想问一下大家，这个问题有没有什么好的解决办法。我该如何包含父类才不会出这样的错呢？
------解决方案--------------------
你把类定义文件们放到相对网站根的固定目录中不就结了
在配置 __autoload 函数，使之能自动加载，而无需到处 include
------解决方案--------------------
放在入口文件，或者公共文件里。或者放到includepath里面
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