php 验证用户名重复

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代码如下

复制代码

$uid = $_request['uid']; checkusername($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 '用户名己经存';   }   else   {    return '可以注册';   }  } }

/*
create table `test`.`cn_user` (
`id` int not null auto_increment ,
`username` varchar( 20 ) not null ,
`times` date null ,
primary key ( `id` )
) engine = myisam

插入数据

insert into `test`.`cn_user` (
`id` ,
`username` ,
`times`
)
values (
null , 'jimmy', null
), (
null , 'www.111cn.net', null
);

*/