if(trim($_POST['password']) != trim($_POST['repassword'])){

exit ("两次使用的密码不一致，请返回上一页");

}

$username = trim($_POST['username']);

$password = md5(trim($_POST['password']));

$conn = mysqli_connect('localhost','root','root','informationtest','3306');

if(mysqli_error($conn)){

mysqli_error($conn);

exit;

}

mysqli_select_db($conn,'my_my');

mysqli_set_charset($conn,'utf8');

insert into informationtest (id,name,password,) value('','$username','$password');

?>