Permanent (301) redirection in PHP

Following is the code for permanent (301) redirect using php.
A better approach would be to use .htaccess but there are situations where .htaccess could not be used

therefore using following code might help

@header("HTTP/1.1 301 Moved Permanently");

@header("location: http://www.mywebsite.com");

Additionally if you want to redirect your home page to always open using www. which might be usefull when using

cookies or for SEO. Add an if condition to code

if (!preg_match('/www..*?/', $_SERVER['HTTP_HOST']))

{

@header("HTTP/1.1 301 Moved Permanently");

@header("location: http://www." . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);

}