PHP获取当前页面url地址（域名、参数、路径）

• 测试网址: http://localhost/blog/testurl.php?id=5
• //获取域名或主机地址
• echo $_SERVER['HTTP_HOST']."
  "; #localhost
• //获取网页地址
• echo $_SERVER['PHP_SELF']."
  "; #/blog/testurl.php
• //获取网址参数
• echo $_SERVER["QUERY_STRING"]."
  "; #id=5
• //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://localhost/blog/testurl.php?id=5
• //包含端口号的完整url
• echo '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);