namereg.php

实现考试管理系统

<?php
ob_start();
session_start();
include 'msg.php';
include 'conn.php';
$username=$_POST['text1'];
$_SESSION["username"]=$username;
if (strlen($username)<=0)
{
$_SESSION['info']="用户名不能为空！";
msg("用户名不能为空","regesit.php");
break;
}
if (strlen($username)>16 || strlen($username)<4)
{
$_SESSION['info']="用户名应为4-16个字符！";
msg("用户名应为4-16个字符！","regesit.php");
break;
}
$str="select * from user where username='" .$username. "'";
$result=mysql_query($str,$link);
if (mysql_num_rows($result)==1)
{ 
$_SESSION['info']="此用户名已存在！";
my_header("regesit.php");
break;
}
else
{
$_SESSION['info']="该用户名可用！";
my_header("regesit.php");
break;
}
mysql_free_result($result);
mysql_close($link);
?>