How can PHP scripts be designed to automatically execute predefined actions upon opening?

To automatically execute predefined actions upon opening a PHP script, you can use the `__construct` magic method in a class. By defining the actions within the `__construct` method, they will be executed whenever an instance of the class is created.

class MyClass {
    public function __construct() {
        // Predefined actions to be executed upon opening
        echo "This will be executed automatically upon opening the script.";
    }
}

// Create an instance of the class to trigger the predefined actions
$myObject = new MyClass();