RewriteEngine
RewriteEngine On it is turn on Rewrite Rules in Apache Server. if you want to turn off, just change the value to off.
Domain Redirection
.htacces code for redirecting yourwebsite.com to www.yourwebsite.com
RewriteRule (.*) http://www.yourwebsite.com/$1 [R=301,L]
Sub Domain Redirection
Sub domain redirection mapping to folder. Here http://www.yourwebsite.com is connecting to website_folder folder.
RewriteCond %{REQUEST_URI} !^/website_folder/
RewriteRule (.*) /website_folder/$1
Here http://subdomain.yourwebsite.com is connecting to subdomain_folder folder.
RewriteCond %{REQUEST_URI} !^/subdomain_folder/
RewriteRule (.*) /subdomain_folder/$1
Htaccess File Inside The Folder.
Old Domain Redirection
htaccess code for redirecting old domain(abc.com) to new domain(xyz.com). Live demo fglogin.com is now redirecting to oauthlogin.com
RewriteRule (.*) http://www.xyz.com/$1 [R=301,L]
RewriteCond %{HTTP_HOST} ^www\.abc\.com
RewriteRule (.*) http://www.abc.com/$1 [R=301,L]
Friendly URLs
Friendly/Pretty URLs help in search engine rankings.
Profile URL
Profile parameter allows [a-zA-Z0-9_-] these inputs. More help read Understanding Regular Expression
http://labs.9lessons.info/profile.php?username=srinivas
to
http://labs.9lessons.info/srinivas
RewriteRule ^([a-zA-Z0-9_-]+)/$ profile.php?username=$1
Messages URL
http://labs.9lessons.info/messages.php?message_username=srinivas
to
http://labs.9lessons.info/messages/srinivas
RewriteRule ^messages/([a-zA-Z0-9_-]+)/$ messages.php?message_username=$1
Friends URL
http://labs.9lessons.info/friends.php?username=srinivas
to
http://labs.9lessons.info/friends/srinivas
RewriteRule ^friends/([a-zA-Z0-9_-]+)/$ friends.php?username=$1
Friends URL with Two Parameters
Here the first parameter allows [a-zA-Z0-9_-] and second parameter allows only number [0-9]
http://labs.9lessons.info/friends.php?username=srinivas&page=2
to
http://labs.9lessons.info/friends/srinivas/2
RewriteRule ^friends/([a-zA-Z0-9_-]+)/([0-9]+)/$ friends.php?username=$1&page=$2
Hiding File Extension
http://www.yourwebsite.com/index.html
to
http://www.yourwebsite.com/index