If you're looking to redirect everything from one domain to another,
DNS Made Easy has a domain redirection config that can be setup through their service. It's very simple to use and basically has no limit on the number of pages that can be redirected in an easy way. You can set it up to redirect everything to a specific url or have everything redirect to their exact same file locations but using a different domain name. This is really useful when switching to a different domain as all you need to do is point the new domain to your website, then make the DNS redirection change and presto - your entire site is now running from the new domain.
If you're only wanting to redirect a few thousand pages, but not ALL pages, then do not go the DNS Made Easy route. There are a few ways you can do this.
One way would be to use a single PHP file for each page you want to redirect. In my opinion, that is not the simplest way to do it.
The best way would be if all the files you want to redirect are in the same folder (without any files being in there that you do not want to redirect). If everything is in a single folder or multiple folders, without other non-redirecting files, then you could use either a single error page for those folders on your site which redirects to a single url or htaccess. Use htaccess if you want each page to point to a unique page on another domain, but those pages on the other domain must be named similarly so that you can script it to be mostly automated in the htaccess config file (or httpd.conf).
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