<?php
class HttpTool
{
    /**
     * //获取域名或主机地址 
     * #测试网址:     http://localhost:8081/test/testurl.php?id=5
     * 返回  localhost:8081
     */
    public function getHost()
    {
        return $_SERVER['HTTP_HOST'];
    }
     
    /**
     * 当前页面的url（包括参数）
     */
    public function getWebUrl()
    {
        $pageURL = 'http';
        if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on")
        {
            $pageURL .= "s";
        }
        $pageURL .= "://";
        $pageURL .= $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
        return $pageURL;
    }
     
    /**
     * 
     * 当前页面的url（不包括参数）
     */
    public function getWebPath()
    {
        $pageURL = 'http';
        if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on")
        {
            $pageURL .= "s";
        }
        $pageURL .= "://";
        $pageURL .= $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
        return $pageURL;
    }
     
    /**
     * 当前页面的父路径
     */
    public function getWebParentPath()
    {
        $pageURL = 'http';
        if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on")
        {
            $pageURL .= "s";
        }
        $pageURL .= "://";
        $pageURL .= $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
        $pageURL = substr($pageURL, 0, strrpos($pageURL, "/"));
        return $pageURL;
    }
     
    /**
     * 服务器名称
     */
    public function getServerName()
    {
        return $_SERVER['SERVER_NAME'];
    }
     
    /**
     * 端口
     */
    public function getServerPort()
    {
        return $_SERVER["SERVER_PORT"];
    }
     
    /**
     * 链接参数，问号?后的参数
     */
    public function getQueryString()
    {
        return $_SERVER['QUERY_STRING'];
    }
     
    /**
     * 请求地址，返回值不host内容
     */
    public function getRequestUri()
    {
        return $_SERVER['REQUEST_URI'];
    }
}
 
$http = new HttpTool();
echo "host===============".$http->getHost() . "<br/>";
echo "weburl=============".$http->getWebUrl() . "<br/>";
echo "webPath============".$http->getWebPath() . "<br/>";
echo "getWebParentPath===".$http->getWebParentPath() . "<br/>";
echo "getServerName======".$http->getServerName() . "<br/>";
echo "getServerPort======".$http->getServerPort() . "<br/>";
echo "getQueryString=====".$http->getQueryString() . "<br/>";
echo "getRequestUri======".$http->getRequestUri() . "<br/>";
 
?>

测试地址：http://localhost:8081/test/httptool.php?name=penngo

输出结果：

host===============localhost:8081
weburl=============http://localhost:8081/test/httptool.php?name=penngo
webPath============http://localhost:8081/test/httptool.php
getWebParentPath===http://localhost:8081/test
getServerName======localhost
getServerPort======8081
getQueryString=====name=penngo
getRequestUri======/test/httptool.php?name=penngo