How to use PHP to obtain the current host, domain name, URL, path, port and other parameters

This article mainly introduces how PHP obtains the current host, domain name, URL, path, port and other parameters. It has certain reference value. Those who are interested can learn about it

Experimental environment:

The test domain name is daxiangtravel.com, the apache root directory/mnt/, the test directory/mnt/qa/test, and the test file name is index.php.

Get the code:

Get the current directory:

 getcwd();
// /mnt/qa/test
dirname(__FILE__);
// /mnt/qa/test

Get the domain name or host address

$_SERVER['HTTP_HOST']; 
 //daxiangtravel.com

Get the web address

$_SERVER['PHP_SELF'];
// /qa/test/index.php

Get the URL parameters

$_SERVER["QUERY_STRING"];
// v=433
获取用户代理

$_SERVER['HTTP_REFERER'];
// http://daxiangtravel.com/qa/test/index.php?v=433

Get the complete url

 '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

Get only the path

$url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"];
echo dirname($url);
// http://daxiangtravel.com/qa/test

The complete url including the port number

 'http://'.$_SERVER['SERVER_NAME'].':'.$_SERVER["SERVER_PORT"]
.$_SERVER["REQUEST_URI"];
// http://daxiangtravel.com:80/qa/test/index.php?v=433

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