php UNSIGNED ZEROFILL

>mysql>CREATE TABLE shop(
>article INT(4) UNSIGNED ZEROFILL DEFAULT '0000'   NOT NULL,
>dealer CHAR(20) DEFAULT '' NOT NULL,
>price DOUBLE(16,2) DEFAULT '0.00' NOT NULL,
>PRIMARY KEY(article,dealer));
mysql>INSERT INTO shop VALUES
->(1,'A',3.45),(1,'B',3.99),(2,'A',10.99),
->(3,'B',1.45),(3,'C',1.69),(3,'D',1.25),
->-(4,'D',19.95);