Detailed explanation of how to obtain the current host, domain name, URL, path, port and other parameters using PHP

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 code:

Get current directory:

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

Get 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 the path only

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

Full url including 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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