How to implement Singleton in PHP (Singleton mode)

How to implement Singleton (Singleton mode) Singleton mode in PHP has the following features :? A singleton class can have only one instance. The singleton class must create its own unique instance. The singleton class must provide this instance to all other objects. Code: Singleton. php: & lt ;? PhpclassSingleton {??? Privatestatic $ instance; how to implement Singleton in PHP (Singleton mode)
The Singleton mode has the following features:

?

1. A singleton class can have only one instance.
2. The singleton class must create its own unique instance.
3. The singleton class must provide this instance to all other objects.

Code:

Singleton. php:

Class Singleton
{
??? Private static $ instance;

??? Private function _ construct ()
??? {
??? }

??? Public static function getInstance ()
??? {
??????? If (self: $ instance = null)
??????? {
??????????? Self: $ instance = new Singleton ();
??????? }

??????? Return self: $ instance;
??? }
}
?>

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In use, because the constructor is private (private), it cannot be instantiated directly. you must use a method similar to the following:

Example:

Require_once ('Singleton. php ');

$ Instance = Singleton: getInstance ();
?>