What considerations should be made when deciding between using textareas or PHP functions for handling string formatting in web applications?

When deciding between using textareas or PHP functions for handling string formatting in web applications, consider the complexity of the formatting needed. If the formatting is simple and can be easily achieved with PHP functions, it may be more efficient to handle it in the backend. However, if the formatting requires user input or dynamic content, using a textarea for user input and processing the data with PHP functions may be more appropriate.

// Example of using PHP functions for string formatting
$string = "hello world";
$formatted_string = strtoupper($string);
echo $formatted_string;