In PHP, how do I filter strings in a high-traffic application?

In high-traffic applications, filtering strings efficiently is crucial to maintain performance and security. PHP offers various functions to filter and sanitize input, ensuring that the application runs smoothly even under heavy load.

Here’s an example of how you can use the `filter_var` function to sanitize a string in PHP:


        <?php
        // Example of filtering a string
        $input_string = "This is a test string with unwanted HTML!";
        $sanitized_string = filter_var($input_string, FILTER_SANITIZE_STRING);
        
        echo $sanitized_string; // Outputs: This is a test string with unwanted HTML!
        ?>