How can code reusability be improved in PHP programming to avoid duplicating code?

Code reusability in PHP programming can be improved by creating functions or classes that encapsulate common logic and can be easily reused in different parts of the codebase. This helps to avoid duplicating code and promotes a more modular and maintainable code structure.

// Example of creating a reusable function in PHP

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

// Example of reusing the function
$area1 = calculateArea(5, 10);
$area2 = calculateArea(3, 7);