How can the constructor and destructor functions be effectively utilized in object-oriented PHP programming to ensure proper class instantiation and cleanup?

To ensure proper class instantiation and cleanup in object-oriented PHP programming, the constructor and destructor functions can be effectively utilized. The constructor function is called when an object is created, allowing for initialization of properties or other setup tasks. On the other hand, the destructor function is called when an object is destroyed, providing an opportunity to release resources or perform cleanup tasks. 

class MyClass {
    public function __construct() {
        // Constructor function for initialization tasks
        echo "Object created\n";
    }

    public function __destruct() {
        // Destructor function for cleanup tasks
        echo "Object destroyed\n";
    }
}

// Instantiate the class
$obj = new MyClass();

// Perform operations with the object

// Object will be automatically destroyed at the end of the script

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