Last Updated: February 25, 2016
· chris15001900

php singleton

Singleton allows you to create an object that has only one instance, e.g. database class to avoid multiple connections:

class Database {

    private static $instance = false;   

    private function __construct() {

    public static function getInstance() {

            if(self::$instance == false) {

                    self::$instance = new Database();


            return self::$instance;                 


    public function connect() {
        // create connection

Then, instead of creating an object, you call a static method of Database class:

$db = Database::getInstance();

Notice the private constructor and $instance variable inside a class.