$args = [id] => 3
        [exchange_id] => 3
        [phase_id] => 2
        [date_create] => 1183992050
        [date_modify] => 1183992050
        [date_expire] => 	


 function __instantiate( $args )
	{	$this -> id 				= (int) $args[ 'id' ];
		$this -> exchange_id		= (int) $args[ 'exchange_id '];
		$this -> phase_id			= (int) $args[ 'phase_id' ];
		echo "<pre>";
		var_dump( $args[ 'exchange_id' ] );
		var_dump( $this -> exchange_id );
		echo "</pre>";
		
		$this -> date_create = (int) $args['date_create'];
		$this -> date_modify = (int) $args['date_modify'];
		$this -> date_expire = (int) $args['date_expire'];
}

OUTPOUT:
string(1) "3"
int(0)