How can PHP developers ensure that all existing links are redirected correctly when changing domains?

When changing domains, PHP developers can ensure that all existing links are redirected correctly by creating a 301 permanent redirect from the old domain to the new domain. This can be achieved by adding the necessary redirect rules to the .htaccess file or by using PHP to handle the redirection. By implementing these redirects, users accessing the old domain will be automatically redirected to the new domain, preserving SEO value and ensuring a seamless transition. 

<?php
// Redirect all traffic from old domain to new domain
if ($_SERVER['HTTP_HOST'] == 'olddomain.com') {
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: http://newdomain.com' . $_SERVER['REQUEST_URI']);
    exit();
}
?>

Keywords

301 redirect htaccess PHP header function domain change URL rewriting

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