clase conexion php

gistfile1.txt

class Conexion{

	private static $objCon = null;
	private static $instancia = null;

	public static function obtenerInstancia(){

		if(self::$objCon == null){

			self::$instancia = new Conexion();
			self::$objCon = mysqli_connect("localhost","root","","{1:base_datos}");

		}
		return self::$objCon;
	}

	function __destruct(){

		mysqli_close(conexion::obtenerInstancia());

	}

}
$rs = conexion::obtenerInstancia();