What are some common pitfalls to avoid when implementing rewrite rules in PHP?

One common pitfall to avoid when implementing rewrite rules in PHP is not properly escaping special characters in the regular expressions used in the rules. This can lead to unexpected behavior or security vulnerabilities. To avoid this, always use the preg_quote() function to escape special characters before using them in a regular expression. 

$pattern = '/^\/blog\/(.+)$/';
$replacement = 'index.php?page=$1';
$escaped_pattern = preg_quote($pattern, '/');
$url = preg_replace('/' . $escaped_pattern . '/', $replacement, $_SERVER['REQUEST_URI']);

Keywords

regex mod_rewrite .htaccess URL rewriting Apache server

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