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What are the potential pitfalls to watch out for when using mod rewrite in PHP, especially for beginners?

Potential pitfalls when using mod_rewrite in PHP, especially for beginners, include incorrect regular expressions leading to unexpected behavior, infinite redirect loops, and misconfigured rewrite rules causing 404 errors. To avoid these issues, ensure that your regular expressions are correctly formatted, be cautious when using the [L] flag to prevent infinite loops, and double-check your rewrite rules for accuracy.

php 
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

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