What are some common pitfalls or errors when implementing mod_rewrite rules in PHP?

One common pitfall when implementing mod_rewrite rules in PHP is not properly escaping special characters in the regex pattern. This can lead to unexpected behavior or errors when matching URLs. To solve this issue, always use the preg_quote() function to escape special characters in the regex pattern. 

// Incorrect way without escaping special characters
$pattern = '/blog/category/(.*)/';

// Correct way with escaping special characters
$pattern = '/blog\/category\/(.*)/';
$escaped_pattern = preg_quote($pattern, '/');

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mod_rewrite rules implementation errors PHP

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