checkusername($uid);

function checkusername()

{

$title = $uid;

if( empty( $title ) )

{

return false;

}

else

{

mysql教程_connect('localhost','root','root');

mysql_select_db('test');

mysql_query("set names 'gb2312'");

$sql = "select * from cn_user where username ='$title'";

$row = mysql_query($sql);

if( mysql_num_rows( $row ) )

{

echo '用戶名己經(jīng)存';

}

else

{

return '可以注冊';

}

}

}

/*

create table `test`.`cn_user` (

`id` int not null auto_increment ,

`username` varchar( 20 ) not null ,

`times` date null ,

primary key ( `id` )

) engine = myisam

插入數(shù)據(jù)

insert into `test`.`cn_user` (

`id` ,

`username` ,

`times`

)

values (

null , 'jimmy', null

), (

null , 'www.jquerycn.cn', null

);

*/