The singleton pattern using PHP
Some application resources are exclusive in that there is one and only one of this type of resource. For example, the connection to a database through the database handle is exclusive. You want to share the database handle in an application because it’s an overhead to keep opening and closing connections, particularly during a single page fetch. The singleton pattern covers this need. An object is a singleton if the application can include one and only one of that object at a time.
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