In PHP, how do I deep copy objects with SPL?

In PHP, you can use the Standard PHP Library (SPL) to create deep copies of objects. One common way to achieve this is by implementing the `Serializable` interface, which allows you to define how your object should be serialized and unserialized. Below is an example demonstrating how to deep copy objects using SPL.


        <?php
        class Person implements Serializable {
            public $name;
            public $age;
            public $friends;

            public function __construct($name, $age) {
                $this->name = $name;
                $this->age = $age;
                $this->friends = [];
            }

            public function addFriend(Person $friend) {
                $this->friends[] = $friend;
            }

            public function serialize() {
                return serialize([$this->name, $this->age, $this->friends]);
            }

            public function unserialize($data) {
                list($this->name, $this->age, $this->friends) = unserialize($data);
            }

            public function __clone() {
                // Deep copy the friends array
                foreach ($this->friends as $index => $friend) {
                    $this->friends[$index] = clone $friend;
                }
            }
        }

        // Example Usage
        $john = new Person("John", 30);
        $mary = new Person("Mary", 28);
        $john->addFriend($mary);

        // Create a deep copy of John
        $johnCopy = clone $john;

        // Modifying the copy's name
        $johnCopy->name = "John Copy";

        // Adding a new friend to the copied object
        $johnCopy->addFriend(new Person("Alice", 25));

        // Original object remains unchanged
        echo $john->name; // Outputs: John
        echo $johnCopy->name; // Outputs: John Copy
        echo count($john->friends); // Outputs: 1
        echo count($johnCopy->friends); // Outputs: 2
        ?>

In PHP, how do I deep copy objects with SPL?

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In PHP, how do I deep copy objects with SPL?

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