使用PHP实现用户登录和注册的功能

时间：2017-05-04 22:04:05 阅读：336 评论：0 收藏：0 [点我收藏+]

登陆界面 login.PHP

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登录处理界面 logincheck.php

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<?php
if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")
{
$user = $_POST["username"];
$psw = $_POST["password"];
if($user == "" || $psw == "")
{
echo "<script>alert(‘请输入用户名或密码！‘); history.go(-1);</script>";
}
else
{
mysql_connect("localhost","root","sixx");
mysql_select_db("vt");
mysql_query("set names ‘gbk‘");
$sql = "select username,password from user where username = ‘$_POST[username]‘ and password = ‘$_POST[password]‘";
$result = mysql_query($sql);
$num = mysql_num_rows($result);
if($num)
{
$row = mysql_fetch_array($result); //将数据以索引方式储存在数组中
echo $row[0];
}
else
{
echo "<script>alert(‘用户名或密码不正确！‘);history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert(‘提交未成功！‘); history.go(-1);</script>";
}
?>

注册界面 register.php

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注册处理界面 regcheck.php

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<?php
if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")
{
$user = $_POST["username"];
$psw = $_POST["password"];
$psw_confirm = $_POST["confirm"];
if($user == "" || $psw == "" || $psw_confirm == "")
{
echo "<script>alert(‘请确认信息完整性！‘); history.go(-1);</script>";
}
else
{
if($psw == $psw_confirm)
{
mysql_connect("localhost","root","sixx"); //连接数据库
mysql_select_db("vt"); //选择数据库
mysql_query("set names ‘gdk‘"); //设定字符集
$sql = "select username from user where username = ‘$_POST[username]‘"; //SQL语句
$result = mysql_query($sql); //执行SQL语句
$num = mysql_num_rows($result); //统计执行结果影响的行数
if($num) //如果已经存在该用户
{
echo "<script>alert(‘用户名已存在‘); history.go(-1);</script>";
}
else //不存在当前注册用户名称
{
$sql_insert = "insert into user (username,password,phone,address) values(‘$_POST[username]‘,‘$_POST[password]‘,‘‘,‘‘)";
$res_insert = mysql_query($sql_insert);
//$num_insert = mysql_num_rows($res_insert);
if($res_insert)
{
echo "<script>alert(‘注册成功！‘); history.go(-1);</script>";
}
else
{
echo "<script>alert(‘系统繁忙，请稍候！‘); history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert(‘密码不一致！‘); history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert(‘提交未成功！‘); history.go(-1);</script>";
}
?>

原文地址：http://www.cnblogs.com/suzmin/p/6809476.html

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