How can the "__PHP_Incomplete_Class Object" error be resolved when working with serialized objects in PHP?

When working with serialized objects in PHP, the "__PHP_Incomplete_Class Object" error occurs when trying to unserialize an object of a class that is not defined. To resolve this error, make sure to include the class definition before unserializing the object. This ensures that PHP can properly recreate the object with all its properties and methods.

// Include the class definition before unserializing the object
include 'class-definition.php';

// Unserialize the object
$serializedObject = '...'; // Serialized object string
$object = unserialize($serializedObject);

// Now you can use the object without the "__PHP_Incomplete_Class Object" error