Problem with "mod_rewrite"

[JackAubrey]

Hi to all, I'm new and I hope you'll apologise my horrendous English.
Since few months, I'm started to study and work with php.
I have a problem with mod-rewrite.
I'm following an exercise of Symfony and it explain that i can use mod-rewrite to convert:

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<a href="/show?id=1.....

in

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"index.php/show?id=1"

(ok this what my php front controller recive in URI)

I enabled mod-rewrite and used this rule (ok I admit, I obtained it with empiric attempts):

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RewriteRule ^show$ index.php/show?id=$1 [L]

My front controller (index.php) receive correct URI, "id" parameter is present in $_GET.... but empty.
If i comment RewriteRule and change

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"<a href="/show?id=1"

with

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"<a href="index.php/show?id=1"

, "id" parameter appear in $_GET and is valorized.

I'm using XAMP 1.8.2 under Windows 7.
Here the part of my httpd.conf concern mod-rewrite:

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LoadModule rewrite_module modules/mod_rewrite.so

#
# DocumentRoot:
#
DocumentRoot "C:/xampp/htdocs"
<Directory "C:/xampp/htdocs">
    Options Indexes FollowSymLinks Includes ExecCGI
   AllowOverride All
   Require all granted
</Directory>


Here my VirtualHost in httpd-vhosts.conf

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<VirtualHost *:80>
   DocumentRoot C:/xampp/htdocs/PHPMVC3
   ServerName phpmvc3
   <Directory C:/xampp/htdocs/PHPMVC3>
      AllowOverride All
   </Directory>
</VirtualHost>


This is my .httaccess

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RewriteEngine On
# RewriteRule ^show$ index.php/show?id=$1 [L]


Where i mistake?
Thanks to all

[Nobbie]

I enabled mod-rewrite and used this rule (ok I admit, I obtained it with empiric attempts):

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RewriteRule ^show$ index.php/show?id=$1 [L]

This is wrong, you assigned "$1" to id (what is a variable of RewriteRule, but empty in this context), instead you should simply assign "1":

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RewriteRule ^show$ index.php/show?id=1 [L]

And finally, in this special case, where you want to copy the original query string to the resulting URI, you dont to specify the query string, because this is the default behaviour of Rewrite, to copy the incoming query string to the resulting URI.

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RewriteRule ^show$ index.php/show [L]

This RewriteRule should already work for you.

[JackAubrey]

Great.... Thanks a lot!
Now it works! Thank you so much for giving me the error explained.