📄 chkname.php
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<?
include("head.inc");
include "db_start.inc";
$username=$_GET[x];
//echo $username;
$a=eregi("^([a-z0-9]{5,10})$",$username);
if(!$a)
{
echo "<script> alert('该用户名非法！');history.back();</script>";
exit;
}
else{
$sql="SELECT * FROM web_user where user_id='$username'";//sql语句
$result = mysql_query($sql);
$row=mysql_fetch_array($result);
if($row==!false)
echo "<script> alert('该用户名已经注册！');</script>";
else
echo "<script> alert('恭喜你，该用户名可以注册！');</script>";
}
?>
<body>
<META HTTP-EQUIV=Refresh CONTENT="2; URL=register.php">
</body>
</html>
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