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getcwd();

// /mnt/qa/test

dirname(__FILE__);

// /mnt/qa/test

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$_SERVER['HTTP_HOST'];

 //daxiangtravel.com

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$_SERVER['PHP_SELF'];

// /qa/test/index.php

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$_SERVER["QUERY_STRING"];

// v=433

获取用户代理

$_SERVER['HTTP_REFERER'];

// http://daxiangtravel.com/qa/test/index.php?v=433

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'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

// http://daxiangtravel.com/qa/test/index.php?v=433

 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];

// http://daxiangtravel.com/qa/test/index.php?v=433

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$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];

echo dirname($url);

// http://daxiangtravel.com/qa/test

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'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"]

.$_SERVER["REQUEST_URI"];

// http://daxiangtravel.com:80/qa/test/index.php?v=433