What are the potential pitfalls of using preg_replace_callback in PHP?

One potential pitfall of using preg_replace_callback in PHP is that it can be resource-intensive, especially when dealing with large amounts of data or complex regular expressions. To mitigate this issue, you can optimize your regular expression patterns and callback functions to make them more efficient. 

// Example of optimizing preg_replace_callback usage
$pattern = '/\b(\w+)\b/';
$text = 'Hello world';
$newText = preg_replace_callback($pattern, function($matches) {
    return strtoupper($matches[0]);
}, $text);
echo $newText;

Keywords

preg_replace_callback PHP regular expressions callback function security vulnerabilities

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