复制代码 代码如下:function getsiteurl()
{
global $_SCONFIG;

if(empty($_SCONFIG["siteallurl"]))
{
$uri = $_SERVER["REQUEST_URI"]?$_SERVER["REQUEST_URI"]:($_SERVER["PHP_SELF"]?$_SERVER["PHP_SELF"]:$_SERVER["SCRIPT_NAME"]);
return shtmlspecialchars("http://".$_SERVER["HTTP_HOST"].substr($uri, 0, strrpos($uri, "/")+1));
}
else
{
return $_SCONFIG["siteallurl"];
}
}

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