PHP中获取当前页面的完整URL

 /**
     * 测试网址 http://a3lscmxz.site.mutaoinc.net/index.php?c=api&m=testHeight
    */
    public function testHeight(){
        //获取域名或主机地址 
            echo $_SERVER['HTTP_HOST']."
"; #a3lscmxz.site.mutaoinc.net
        //获取网页地址 
            echo $_SERVER['PHP_SELF']."
"; #echo /index.php
        //获取网址参数 
            echo $_SERVER["QUERY_STRING"]."
"; #c=api&m=testHeight
        //获取用户代理 
            echo $_SERVER['HTTP_REFERER']."
"; 
        //获取完整的url
            echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']."
";
            echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING']."
";
            #http://a3lscmxz.site.mutaoinc.net/index.php?c=api&m=testHeight
            #http://a3lscmxz.site.mutaoinc.net/index.php?c=api&m=testHeight
        
        //包含端口号的完整url
            echo 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]."
"; 
            #http://a3lscmxz.site.mutaoinc.net:80/index.php?c=api&m=testHeight
        //只取路径
        $url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]."
"; 
            echo dirname($url);  #http://a3lscmxz.site.mutaoinc.net
        
    }