Creating the Singleton design pattern in PHP5

Question

How would one create a Singleton class using PHP5 classes?

Answer 1

This article covers topic quite extensively: http://www.phptherightway.com/pages/Design-Patterns.html#singleton

Note the following:

• The constructor __construct() is declared as protected to prevent creating a new instance outside of the class via the new operator.
• The magic method __clone() is declared as private to prevent cloning of an instance of the class via the clone operator.
• The magic method __wakeup() is declared as private to prevent unserializing of an instance of the class via the global function unserialize().
• A new instance is created via late static binding in the static creation method getInstance() with the keyword static. This allows the subclassing of the class Singleton in the example.