What is 301 redirect ?
You have a website and its all pages are
ranked in the search engine. And now you’ve moved these files to a new
domain. What will happen in this scenario!!. You are sending the visitor
to “Error 404 – File not found” page when they follow your website in
the search engine. Furthermore, if you place the custom error page,
then also you will be keep loosing ranking in upcoming days in search
engines as the original file could not be found in the old URL. So what
is the solution for this?? The solution is 301 redirect which means
moved permanently. It is is the most efficient and search engine as well
as visitor friendly method for the webpage redirection.
Why do you need 301 redirect ?
Have you ever typed yahoo.com in your
browser, what happens next is it will redirect you to www.yahoo.com, its
all the result of the 301 redirect. so, why do you need to do so?. If
you’re not doing so, then you’re splitting yourself to two different URL
and search engine spiders can also crawls your site’s content by two
different URL which may result to “duplicate content” penalty by search
engines if search engines collect two copies of the same data from two
different URLs.
How to do 301 redirect in PHP ?
If you want to redirect a single page to another location then put the following code in the old page which have been moved.
<?php
header('HTTP/1.1 301 Moved Permanently');
header('Location: http://www.new-domain.com/new-file-name.php');
?>
If you want to redirect non-www to www domain name then put the following code into top of every page of the website
<?php
if (substr(getenv('HTTP_HOST'),0,3) != 'www')
{
header('HTTP/1.1 301 Moved Permanently');
header('Location:http://www.'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
}
?>
How to do 301 redirect in .htaccess file?
Put the following code into the .htaccess
file and upload it into the root folder of the website. Note that this
file only works for the website which is running under Apache Web
Server.
RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain\.com
RewriteRule (.*) http://www.domain.com/$1 [R=301,L]
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