Question

If user visits /abc,

and there is no file/directory named abc under /,redirect it to /test.php?from=abc,

but if it exists,don’t redirect.

Answer 1

RewriteCond %{SCRIPT_FILENAME} !-f
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule ^(.*)$ test.php?from=$1

RewriteCond is a conditional – the following rule will only execute if the condition is true.

The -f test checks if a file exists, the -d test checks if a directory exists.

SCRIPT_FILENAME will be set to the system path that Apache would use to fetch a file (e.g. /var/www/html/blah.html)

So it checks to see that the file doesn’t exist, then it checks to see that the directory doesn’t exist. If both those conditions are met, it processes the rule.

Example:

• Your DOCUMENT_ROOT is set to /var/www/html
• Your user requests http://yoursite/blah.html
• Firstly we check to see if /var/www/html/blah.html is a file
• Then we check to see if /var/www/html/blah.html is a directory
• If there is no file or directory of that name, it rewrites to http://yoursite/test.php?from=blah.html

Documentation for RewriteCond