Singleton design pattern. Simple example in PHP
We use the singleton pattern in order to restrict the number of instances that can be created from a resource consuming class to only one.
The anatomy of a singleton pattern
Let's start by understanding the structural characteristics of a class that obeys the singleton pattern:
1) A private constructor is used to prevent the direct creation of objects from the class.
2) The expensive process is performed within the private constructor.
3) The only way to create an instance from the class is by using a static method that creates the object only if it wasn't already created.
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