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PHP OOPs Interview Questions and Answers

Question: Explain the Singleton design pattern in PHP.

Answer: The Singleton pattern ensures that a class has only one instance and provides a global point of access to that instance. It involves a private constructor and a static method to get the instance.

Example:

class Singleton { 
private static $instance; 
private function __construct() { /* private constructor */ } public static function getInstance() { 
if (!self::$instance) { 
self::$instance = new self(); 
} 
return self::$instance; 
} 
}

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