Redirection oddities with conditions and querystring - php

Question

Here's essentially what I'm trying to do:
If the URL a visitor requests points to a file or directory, show that file
Else, redirect back to the index.php file
The .htaccess file below is working great; the only issue I'm facing is that if the URL a visitor requests is a PHP file with $_GET parameters, they are taken to the index.php file instead of the file they should be going to. Any ideas on how I can fix that?
# Prevent "Index Of" pages
Options -Indexes
# Rewrite
RewriteEngine on
# Rewrite www to non-www
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
# If requested resource exists as a file or directory, go to it
RewriteCond %{DOCUMENT_ROOT}/$1 -f [OR]
RewriteCond %{DOCUMENT_ROOT}/$1 -d
RewriteRule (.*) - [L]
# Else rewrite requests for non-existent resources to /index.php
RewriteRule (.*) /index.php?url=$1

Answer 1

Apache normally cuts off the query string. To append it, the qsappend flag (QSA) should be included in all your rewriteRule lines, like this:
# Prevent "Index Of" pages
Options -Indexes
# Rewrite
RewriteEngine on
# Rewrite www to non-www
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L,QSA]
# If requested resource exists as a file, do not rewrite.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) /index.php?url=$1 [QSA]
// EDIT: You are explicitly rewriting existing files to themselves. Just don't do that, but bail out if your URL hits an existing file. (code above edited.)

Answer 2

Problem
# If requested resource exists as a file or directory, go to it
RewriteCond %{DOCUMENT_ROOT}/$1 -f [OR]
RewriteCond %{DOCUMENT_ROOT}/$1 -d
RewriteRule (.*) - [L]
Aren't you potentially looking for a file like "somepath.php?querystring" on the filesystem, by doing this? I think that $1 includes the querystring.
So these conditions fail, and you fall through to the final rewrite rule. The user gets sent to index.php, but they lose the giveaway querystring because you're not using [QSA].
Solution
Try:
# If requested resource exists as a file or directory, go to it
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule (.*) - [QSA,L]
Don't forget [QSA] to keep the querystring, if present.
You should add it to the final rule, too:
# Else rewrite requests for non-existent resources to /index.php
RewriteRule (.*) /index.php?url=$1 [QSA]
Suggestion
Are you sure you want to do no-op rewrites? That's a bit odd.
How about negating the logic and combining those two rules? Like so:
# If requested resource doesn't exist as a file or directory, rewrite to /index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) /index.php?url=$1 [QSA,L]

Answer 3

Mod_rewrite documentation. Search for QSA