HTML forms and htaccess altering visible URL

hopefully this will make sense, here is what I am trying to achieve.

I have an input box (search box) on a form on a dynamic html page (index.php). it writes to variable 'param' on submit.

on submit I need to dynamically create a web page, (easy) I guest use $_REQUEST['param'] in my php.

but what I  need to do is redirect the page to
mydomain.com/value/
where value is the user entered text in the input box

this is where I am struggling, what is the best way to achieve this.

note, I currently have entry in htaccess that does the other way around, ie
mydomain.com/value/ is changed to mydomain.com/index.php?param=value
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thydzikAsked:
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thydzikConnect With a Mentor Author Commented:
thank you for this, but I would prefer not to rely on javascript.
I have almost achieved this by using a second htaccess rewrite rule.
however, because I have the 2 doing exactly the same, it seems to be in an infinite loop.

could you please suggest how to prevent this.
code attached.
RewriteCond %{QUERY_STRING} ^param=([a-zA-Z0-9_]+)$
RewriteRule ^index\.php$ /%1? [R,L]

RewriteRule ^([a-zA-Z0-9_]+)$ index.php?param=$1 [L]

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McNeticConnect With a Mentor Commented:
If you can rely on javascript being enabled, the simplest way would be to change the action property of the form in an onsubmit handler prior to sending. This will result in the browser directly navigating to the correct url. If you don't want to rely on js, you can send a single Location header in php (look below). This has the drawback that the browser will first receive the page with the location header, then the 'real' page, but usually, this is fast and the user doesn't notice.
header("Location: mydomain.com/value/");

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SnarflesConnect With a Mentor Commented:
What McNetic said I think is what you need. I don't know why you need to do it in the htaccess.
header("Location: mydomain.com/".$_REQUEST['param']."/"); 

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thydzikAuthor Commented:
okay, but how do I stop it looping,
the idea is that each value search will have its own url, mydomain.com/value/

so mydomain.com/value/ will really be mydomain.com/index.php?param=value

if I implement
header("Location: mydomain.com/".$_REQUEST['param']);
it will continue to loop
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SnarflesCommented:
Aaaah. Ok Sorry I missunderstood your question :)

I'll have a think but I'm not expert on the htaccess.
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thydzikAuthor Commented:
okay, I have solved this in the htaccess by placing a dummy variable in one of the cases.

but could I please get a 3rd experts opinion as to if it is better to implement this in htaccess or via the location header.
RewriteCond %{QUERY_STRING} ^param=([a-zA-Z0-9_]+)$
RewriteRule ^index\.php$ /%1? [R,L]

RewriteRule ^([a-zA-Z0-9_]+)$ index.php?param=$1&a [L]

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McNeticConnect With a Mentor Commented:
If it works as intended with the RewriteRules, this solution is technically equivalent to the Location: header. mod_rewrite then does redirects in the same way, by sending this header. Probably, your solution is faster, as php processing is left out, and the rewrite engine is processed anyways.
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