PHP interface resizable: Resizing functionality in the square class

PHP OOP: Exercise-4 with Solution

Write a PHP interface called 'Resizable' with a method 'resize()'. Implement the 'Resizable' interface in a class called 'Square' and add functionality to resize the square.

Sample Solution:

PHP Code :

<?php
interface Resizable {
    public function resize($percentage);
}

class Square implements Resizable {
    private $side;

    public function __construct($side) {
        $this->side = $side;
    }

    public function resize($percentage) {
        $this->side = $this->side * ($percentage / 100);
    }

    public function getArea() {
        return pow($this->side, 2);
    }

    public function getSide() {
        return $this->side;
    }
}

$square = new Square(10);
echo "Initial Side Length: " . $square->getSide() . "</br>";

$square->resize(60); // Resize the square to 60% of its original size
echo "Resized Side Length: " . $square->getSide() . "</br>";

echo "Area: " . $square->getArea() . "</br>";
?>

Sample Output:

Initial Side Length: 10
Resized Side Length: 6
Area: 36

Explanation:

In the above exercise -

• The Resizable interface defines a contract with a single method resize(). Any class that implements this interface must implement the resize() method.
• The "Square" class implements the Resizable interface and provides its own implementation for the resize() method. It also has a private property $side to represent the sides of the square.
• The resize() method in the Square class resizes the square by adjusting its side length based on the provided percentage.
• The getArea() method calculates and returns the square area using the formula: side * side.
• The getSide() method returns the current square side length.

Flowchart:

PHP Code Editor:

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