Method Chaining OOP in PHP

Method chaining in PHP allows you to call multiple methods on the same object in a single line of code. This is achieved by returning the object itself ($this) from each method, so that the next method can be called on the same instance.

Here’s an example:

Example of Method Chaining in PHP

class Car {
    private $speed = 0;
    private $gear = 1;

    public function setSpeed($speed) {
        $this->speed = $speed;
        return $this;  // Return the current object
    }

    public function setGear($gear) {
        $this->gear = $gear;
        return $this;  // Return the current object
    }

    public function display() {
        echo "Speed: $this->speed, Gear: $this->gear\n";
        return $this;  // Return the current object
    }
}

// Method chaining example
$car = new Car();
$car->setSpeed(50)->setGear(3)->display();

Explanation:

• Each method (setSpeed, setGear, display) returns the same object ($this), allowing you to chain method calls in sequence.
• This style of code is common in fluent interfaces, making the code more readable and concise.

Use Cases:

• Method chaining is often used in classes like query builders, configuration setters, or even model builders where multiple properties or behaviors are set in sequence.