gistfile1.txt

final class myClass {

private static $instance;

	
	public static function instance() {
		if ( ! isset( self::$instance ) && ! ( self::$instance instanceof myClass ) ) {
			self::$instance = new myClass;
			self::$instance->setup_constants();
		}
		return self::$instance;
	}
private function setup_constants() {

		// Client Acess Token
			define( 'BIW_CLIENT_ID', '89345938645936b' );
	}
	
	

}