PHP version 8.0 - Named Parameters

Named Parameters in PHP 8

Now, in PHP 8, we can write functions using Named Parameters.

For example, suppose you have a function add($id, $title, $quantity). You can call it in the following ways:

add(id: 1, title: "Phone", quantity: 2);
add(title: "Phone", id: 2, quantity: 2);

Named Parameters: This feature allows you to change the order of arguments when calling a function, as long as you specify the parameter names correctly in the function definition.

//Example 1: 
function createUser($name, $role = 'user', $isActive = true) {

    echo $name."-".$role;
}

createUser(name: 'Hòa Nguyễn', isActive: false, role:"admin");

//Example 2:
class CartService{

    public function add(int $id, string $title, bool $isActive = true) : string {
        return "$id, $title đã được thêm vào giỏ hàng";
    }
}

$cart = new CartService;
echo $cart->add(1, "Phone", true)."\n";
echo $cart->add(id: 2, isActive: true, title: "hoa")."\n";

//Example 3:
function sendEmail(string $from, string $to, string $subject, string $message,
 bool $isHtml = false) {
    echo "From: $from\n";
    echo "To: $to\n";
    echo "Subject: $subject\n";
    echo "Message: $message\n";
    echo "Is HTML: " . ($isHtml ? 'Yes' : 'No') . "\n";
}

//Gọi hàm với Named Arguments
sendEmail(
    from: "[e-mail]",
    to: "[e-mail]", 
    message: "This is a test email. Hòa Nguyễn Coder", 
    subject: "Hòa Nguyễn Coder", 
    isHtml: true);

PHP version 8.0 - Named Parameters

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