How can PHP functions be effectively used to modularize and organize code for better readability and maintenance?

To modularize and organize code in PHP, functions can be used to encapsulate specific tasks or logic into reusable blocks of code. This helps in improving readability by breaking down the code into smaller, more manageable parts. Additionally, using functions allows for easier maintenance as changes can be made in one central location rather than scattered throughout the codebase.

// Example of using functions to modularize and organize code

// Function to calculate the area of a rectangle
function calculateRectangleArea($length, $width) {
    return $length * $width;
}

// Function to display a message with the calculated area
function displayAreaMessage($area) {
    echo "The area of the rectangle is: " . $area;
}

// Main code
$length = 5;
$width = 10;
$area = calculateRectangleArea($length, $width);
displayAreaMessage($area);