How can PHP functions be optimized and simplified to focus on specific tasks rather than including unnecessary code?

To optimize and simplify PHP functions to focus on specific tasks rather than including unnecessary code, it is important to break down the function into smaller, more specialized functions that each handle a specific task. This not only makes the code easier to read and maintain but also allows for better code reusability. By identifying the core functionality of the function and separating it from unrelated tasks, you can create more efficient and focused functions.

function calculateArea($length, $width) {
    return $length * $width;
}

function calculatePerimeter($length, $width) {
    return 2 * ($length + $width);
}