singleton in php
// General singleton class.
class Singleton {
// Hold the class instance.
private static $instance = null;
// The constructor is private
// to prevent initiation with outer code.
private function __construct()
{
// The expensive process (e.g.,db connection) goes here.
}
// The object is created from within the class itself
// only if the class has no instance.
public static function getInstance()
{
if (self::$instance == null)
{
self::$instance = new Singleton();
}
return self::$instance;
}
}
