global $_SCONFIG; //定义全局变量$_SCONFIG($_SCONFIG其实是个数组var,在common.PHP中有定义) if(empty($_SCONFIG['siteallurl'])) //判断$_SCONFIG['siteallurl']变量是否为空 $uri = $_SERVER['REQUEST_URI']?$_SERVER['REQUEST_URI']:($_SERVER['PHP_SELF']?$_SERVER['PHP_SELF']:$_SERVER['SCRIPT_NAME']); //将$_SERVER['REQUEST_URI'];$_SERVER['PHP_SELF'];$_SERVER['SCRIPT_NAME']通过三目运算后把结果给$url //$_SERVER也是数组,你可以打印一下,就知道干吗用的了.这里只涉及到三个数组元素 //$_SERVER['REQUEST_URI']; //REQUEST_URI:/mysite/->站点目录? //$_SERVER['PHP_SELF']; //PHP_SELF:/mysite/index.PHP->当前正在执行脚本的文件名 //$_SERVER['SCRIPT_NAME']; //SCRIPT_NAME:/mysite/index.PHP->包含当前脚本的路径

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