How can the code be optimized to improve functionality and readability?

Issue: The code can be optimized by refactoring repetitive code blocks into reusable functions and using proper variable naming conventions to improve readability.

// Optimized code with reusable functions and improved variable names

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

$length = 10;
$width = 5;
$area = calculateArea($length, $width);

echo "The area is: " . $area;