Creating a globally accessible MySQLi object

Question

I have multiple classes that use static methods. These functions connect to the database using

$mysqli = new mysqli(DB_SERVER, DB_USER, DB_P         


        

Answer 1

Here is one approach:

Create a singleton class, that can be accessed statically from anywhere.

class DBConnector {
    private static $instance ;
    public function __construct($host, $user, $password, $db){
      if (self::$instance){
        exit("Instance on DBConnection already exists.") ;
      }
    }

    public static function getInstance(){
      if (!self::$instance){
        self::$instance = new DBConnector(a,b,c,d) ;
      }
      return $instance ;
    }
}

An example would be:

$mysqli = DBConnector::getInstance() ;

Hovewer I suggest using another solution as well:

$mysqli = new MySQLi(a,b,c,d) ;

Then you could pass that object to other classes (constructor)

class Shop {
  private $mysqli ;
  public function __construct(MySQLi $mysqli){
    $this->mysqli = $mysqli ;
  }
}

$show = new Shop($mysqli) ;