PHP中获取当前页面的完整URL和部分URL
javascript实现：top.location.href 顶级窗口的地址this.location.href 当前窗口的地址
#测试网址: http://localhost/blog/testurl.php?id=5
//获取域名或主机地址echo $_SERVER['HTTP_HOST']."<br>"; #localhost
//获取网页地址echo $_SERVER['PHP_SELF']."<br>"; #/blog/testurl.php
//获取网址参数echo $_SERVER["QUERY_STRING"]."<br>"; #id=5
//获取用户代理echo $_SERVER['HTTP_REFERER']."<br>";
//获取完整的urlecho 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];echo 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];#http://localhost/blog/testurl.php?id=5
//包含端口号的完整urlecho 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];#http://localhost:80/blog/testurl.php?id=5
//只取路径$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];echo dirname($url);#http://localhost/blog
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