Step 1
Go to your domain DNS(Domain Name Settings), click add zone record.
Step 2
You need to create a custom A record to serve all your subdomains. Select A record, HOST * POINTS TO: Your ID Address(Eg: 106.21.252.71)
Repeat the same for HOST @, here is the listed A records.
Now add CNAME record, HOST www POINTS TO @ this refers to your IP address.
CNAME list should be in following way.
Save all of your domain DNS settings.
Working with Hosting Server
We can achieve dynamic
subdomains system with .htaccess URL redirection configuration file,
here I have a project directory called yourwesbite_folder
This file is redirection http://www.yourwesbite.com to http://yourwebsite.com for home page use. All of the subdomain redirection to yourwebsite_folder
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.yourwebsite.com
RewriteRule (.*) http://yourwebsite.com/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^yourwebsite\.com $
RewriteCond %{REQUEST_URI} !^/yourwebsite_folder/
RewriteRule (.*) /yourwebsite_folder/$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteCond %{REQUEST_URI} !^/yourwebsite_folder/
RewriteRule (.*) /yourwebsite_folder/$1
RewriteCond %{HTTP_HOST} ^www.yourwebsite.com
RewriteRule (.*) http://yourwebsite.com/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^yourwebsite\.com $
RewriteCond %{REQUEST_URI} !^/yourwebsite_folder/
RewriteRule (.*) /yourwebsite_folder/$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteCond %{REQUEST_URI} !^/yourwebsite_folder/
RewriteRule (.*) /yourwebsite_folder/$1
(2) Inside Folder .htaccess
This file is rewriting the subdomain urls.
http://yourwesbite.com/index.php?siteName=9lessons
to
http://9lessons.yourwebsite.com
Options +FollowSymLinks
RewriteEngine On
RewriteBase /
RewriteRule ^([aA-zZ])$ index.php?siteName=$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteRule (.*) index.php?siteName=%1
RewriteEngine On
RewriteBase /
RewriteRule ^([aA-zZ])$ index.php?siteName=$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteRule (.*) index.php?siteName=%1
More .htaccess tips: Htaccess File Tutorial and Tips.
index.php
This file contains simple PHP code, using regular expressions validating the subdomain value.
<?php
$siteName='';
if($_GET['siteName'] )
{
$sitePostName=$_GET['siteName'];
$siteNameCheck = preg_match('~^[A-Za-z0-9_]{3,20}$~i', $sitePostName);
if($siteNameCheck)
{
//Do something. Eg: Connect database and validate the siteName.
}
else
{
header("Location: http://yourwebsite.com/404.php");
}
}
?>
//HTML Code
<!DOCTYPE html>
<html>
<head>
<title>Project Title</title>
</head>
<body>
<?php if($siteNameCheck) { ?>
//Home Page
<?php } else { ?>
//Redirect to Subdomain Page.
<?php } ?>
</body>
</html>
$siteName='';
if($_GET['siteName'] )
{
$sitePostName=$_GET['siteName'];
$siteNameCheck = preg_match('~^[A-Za-z0-9_]{3,20}$~i', $sitePostName);
if($siteNameCheck)
{
//Do something. Eg: Connect database and validate the siteName.
}
else
{
header("Location: http://yourwebsite.com/404.php");
}
}
?>
//HTML Code
<!DOCTYPE html>
<html>
<head>
<title>Project Title</title>
</head>
<body>
<?php if($siteNameCheck) { ?>
//Home Page
<?php } else { ?>
//Redirect to Subdomain Page.
<?php } ?>
</body>
</html>
No Subdomain Folder
If you are using root directory(htdocs/public_html) as a project directory, use this following .htaccess file.
Options +FollowSymLinks
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www.yourwebsite.com
RewriteRule (.*) http://yourwebsite.com/$1 [R=301,L]
RewriteRule ^([aA-zZ])$ index.php?siteName=$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteRule (.*) index.php?siteName=%1
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www.yourwebsite.com
RewriteRule (.*) http://yourwebsite.com/$1 [R=301,L]
RewriteRule ^([aA-zZ])$ index.php?siteName=$1
RewriteCond %{HTTP_HOST} ^(^.*)\.yourwebsite.com
RewriteRule (.*) index.php?siteName=%1
Credit to 9lessons
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