What potential pitfalls should be considered when using preg_replace_callback in PHP scripts?

When using preg_replace_callback in PHP scripts, it's important to be aware of potential pitfalls such as security vulnerabilities if user input is not properly sanitized. To mitigate this risk, always validate and sanitize user input before using it in the callback function to prevent code injection attacks. 

// Example of using preg_replace_callback with proper input validation
$input = $_POST['input'];

// Validate and sanitize user input
if (preg_match('/^[a-zA-Z0-9]+$/', $input)) {
    $output = preg_replace_callback('/pattern/', function($matches) {
        // Your callback logic here
    }, $input);
} else {
    echo "Invalid input";
}

Keywords

preg_replace_callback regular expressions callback function security vulnerabilities input validation

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