.htaccess - Can I redirect a subdomain to a particular webpage and process the subdomain value with PHP -

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i familiar modifying htaccess files not sure if following possible:

ultimately, want point users 'imaginary' subdomains (those not exist) subdomain can parsed correctly php , mysql find particular member's information.

for example:

when goes www.site.com currently, shows parent site including information on how become member. once person member, 'unique' url is:

www.site.com?memberid=12345

ultimately, forcing member remember question mark agent equals can confusing along need remember proper capitalization , such.

i 'like' achieve following:

www.12345.site.com

redirects

www.site.com/index.php (and index.php reads 12345 $_get function lookup id, valid , retun response based on that.

i realize achieve same using information after hash:

e.g. www.site.com/12345

but issue have other pages using /xxxx modify client content don't want block anybody's ability visit: www.site.com/contact example

(where site redirects index, tries memberid = 'contact' , not find results).

intiial thoughts:

options +followsymlinks rewriteengine on  rewritecond %{http_host} ^subdomain.example.com$ [nc] rewriterule (.*) http://subdomain.example.com/$1 [r=301,l]

but doesn't seem work. note: htaccess file strips file exnteions pages (i.e. www.site.com/contact.php displays www.site.com/contact)

any appreciated.

update regarding first suggestion -

my .htaccess currently:

errordocument 404 /404.php options +followsymlinks rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*)$ $1.php rewritecond %{http_host} ^(\w+).site.com$ [nc] rewriterule (.*) /subdomain.php?id=%1 [l]

i expect based off needs typing www.something.site.com redirected to: www.site.com/processing_page.php?something

instead, redirects mediatemple hosting page (essentially stating no subdomain named 'something' exists.

if go www.site.com, throws 503 error:

internal server error  server encountered internal error or misconfiguration , unable complete request.  please contact server administrator, email , inform them of time error occurred, , might have done may have caused error.  more information error may available in server error log.  apache server @ www.contendertest.com port 80

the apache error log states:

[thu jan 27 12:43:37 2011] [error] [client 1.2.3.4] request exceeded limit of 10 internal redirects due probable configuration error. use 'limitinternalrecursion' increase limit if necessary. use 'loglevel debug' backtrace.

attempt 2

my .htaccess file stripped to:

rewritecond %{http_host} !^www\. rewritecond %{http_host} ^(.+)\.site\.com rewriterule .* http://site.com/processing_page.php?id=%1 [l,r]

this still directs media temple random landing page however.

your looking "rewritecond backrefereces". take form %1 rather usual $1 current rewriterule.

so example might like:

rewritecond %{http_host} ^(\w+).example.com$ [nc] rewriterule (.*) /subdomain.php?id=%1 [l]

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