How can the use of functions and modularization improve code maintainability and reusability in PHP?

Using functions and modularization in PHP can improve code maintainability and reusability by breaking down the code into smaller, manageable chunks that can be easily understood and maintained. Functions allow for code reusability, as they can be called multiple times throughout the program without having to rewrite the same logic. Modularization involves organizing code into separate files or modules, which makes it easier to locate and update specific functionality without affecting the rest of the codebase. 

// Example of using functions and modularization in PHP

// Function to calculate the square of a number
function calculateSquare($num) {
    return $num * $num;
}

// Function to calculate the sum of two numbers
function calculateSum($num1, $num2) {
    return $num1 + $num2;
}

// Main program logic
$num1 = 5;
$num2 = 3;

$square = calculateSquare($num1);
$sum = calculateSum($num1, $num2);

echo "Square of $num1: $square\n";
echo "Sum of $num1 and $num2: $sum\n";

Keywords

functions modularization code maintainability reusability PHP

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