set_include_path和require,include
在PHP中经常使用include，require来引用其他文件，使用相对路径或者绝对路径，如果通过set_include_path函数或者ini_set(‘include_path’,xxx)设置include_path配置选项，那么require文件如果在其他目录也可以直接引用。
设置include_path配置选项
如：require_once “class.smarttemplate.php”，这个文件其实并不在当前文件所在目录，但是同样可以这样直接引用。因为前面通过ini_set设置了include_path：
// 包含配置文件和函数库路径ini_set('include_path', INCLUDE_PATH . DS . "library" . PATH_SEPARATOR . ini_get('include_path'));set_include_path函数
set_include_path函数和ini_set(‘include_pah’,xxx)作用是一样的，只不过ini_set方式适合所有PHP版本，对现在来说两者没有差别。
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