redirecting urls that contain the "?" character in the file names

I'm a novice php/mysql developer and need some help.

I was working on a project with a .NET developer. He built a URL redirecting function in .NET that uses the ? in the URL (eg, mysite.com?123 redirects to www.realsite.com. This developer has now disappeared on me and I no longer have access to the server.

I need to move my domain to a new server and recreate this functionality in ph开发者_StackOverflow社区p/mySQL. I have about 40 urls that I need to support using this technique (they're embedded in QR codes). I don't need a solution that generates new redirects this way - I've got a different solution going forward.

My new server will be on bluehost.

Many thanks to anyone who can help me.

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To replicate the original setup you dond't need to involve PHP at all. You can accomplish this at the server level using some RewriteRules:

RewriteCond %{QUERY_STRING} ^123$
RewriteRule ^$ http://realsite.com/

See also http://wiki.apache.org/httpd/RewriteQueryString

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The query string can be found in $_SERVER['QUERY_STRING'].

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On your old host for mysite.com domain create a .htaccess file in DOCUMENT_ROOT like this:

Options +FollowSymlinks -MultiViews
RewriteEngine on

# for HTTP traffic
RewriteCond %{QUERY_STRING} !^$
RewriteCond %{SERVER_PORT} =80
RewriteRule ^/?$ http://www.realsite.com/? [R=301,L]

# for HTTPS traffic
RewriteCond %{QUERY_STRING} !^$
RewriteCond %{SERVER_PORT} =443
RewriteRule ^/?$ https://www.realsite.com/? [R=301,L]

Above code will redirect every URI that looks like mysite.com?foo to http://www.realsite.com/ with HTTP status code 301.

? in the end will discard any existing QUERY string.

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http://example.com?123

would be the equivalent of doing

http://example.com/index.php?123

Your choices would be either to catch those codes via mod_rewrite and redirect the request to a script specifically set up to handle these legacy urls. Or you can modify the index.php script to look for the codes and do whatever it has to at that point.