Creating the Singleton design pattern in PHP5

Question

How would one create a Singleton class using PHP5 classes?

Answer 1

This is the example of create singleton on Database class

design patterns 1) singleton

class Database{
  public static $instance;
  public static function getInstance(){
    if(!isset(Database::$instance)){
    Database::$instance=new Database();

     return Database::$instance;
    }

  }

  $db=Database::getInstance();
  $db2=Database::getInstance();
  $db3=Database::getInstance();

  var_dump($db);
  var_dump($db2);
  var_dump($db3);

then out put is --

  object(Database)[1]
  object(Database)[1]
  object(Database)[1]

use only single instance not create 3 instance