php注册登录系统
A. php实现用户注册和登入，不用做效果求大牛指导
登陆界面 login.php
<form action="logincheck.php" method="post">
用户名：<input type="text" name="user"/><br/>
密码：<input type="password" name="pass"/><br/>
<input type="submit" name="sub" value="登陆"/>
<a href="register.php">注册</a>
</form>
登陆处理界面logincheck.php
<?php
mysql_connect('localhost','root','');
mysql_select_db('test');
mysql_query("set names 'gbk'");
$nsql="select username,passwd,nick from userinfo where username = '$_POST[user]' and passwd = '$_POST[pass]'";
$result = mysql_query($nsql);
$num = mysql_num_rows($result);
if($num){
$row = mysql_fetch_array($result);
echo "欢迎您，$row[2]";
}else{
echo"<script>alert('用户名或密码不正确');history.go(-1);</script>";
}
?>
注册界面register.php
<form action="regcheck.php" method="post">
用户名：<input type="text" name="user"/><br/>
密码:<input type="password" name="pass"/><br/>
昵称：<input type="text" name="nick"/><br/>
<input type="submit" name="sub" value="注册"/>
</form>
注册处理界面regcheck.php
<?php
mysql_connect('localhost','root','');
mysql_select_db('test');
mysql_query("set names 'gbk'");
$nsql="select username from userinfo where username = '$_POST[user]'";
$result = mysql_query($nsql);
$num = mysql_num_rows($result);
if($num){
echo "<script>alert('用户名已存在注册失败');history.go(-1);</script>";
}else{
$isql = "insert into userinfo values('$_POST[user]','$_POST[pass]','$_POST[nick]')";
mysql_query($isql);
echo"<script>alert('注册成功');history.go(-1);</script>";
}
?>
B. php用户注册登录,不使用mysql
php用户注册登录,不使用mysql
首先得到提交的数据
链接数据库,查询数据库,查询username 和pwd
提交的username 和 pwd 跟数据库查询的username 和pwd做对比,
都相等那就是登陆成功
C. 用PHP做登陆注册页面
登录页：login.php
<?php
include("conn.php");
$username=$_POST['name'];
$password=$_POST['password'];
$yanzheng=$_POST['yanzheng'];
if(isset($_POST['submit']))
{
$sql=("select username,password from member where username='$username' and password='$password'") or die("sql语句执行失败");
//print_r($sql);
$ar=mysql_query($sql);
if($ar)
{
if($row=mysql_fetch_array($ar))
{
session_start();
if($_POST["yanzheng"])
{
if($yanzheng!=$_session[pic]||$yanzheng=="")
{
echo "验证码输入有误";
exit;
}
if($yanzheng==$_session[pic])
{
header("location:index.php");
}
}
}
else
{
echo "用户名或密码错误";
}
}
}
?>
<form action="login.php" method="post">
<table border=1 align=center width=500 height=300 bgColor=#DFFFDF bordercolor=#fffbec>
<tr>
<td colspan=2 align=center>用户登录</td>
</tr>
<tr>
<td>用户姓名：</td>
<td><input type="text" name="name" id="name"/></td>
</tr>
<tr>
<td>用户密码：</td>
<td><input type="password" name="password" id="password"/></td>
</tr>
<tr>
<td>验证码：</td>
<td><input type="text" name="yanzheng" id="yanzheng"/>
<img src="yanzheng1.php" width="50" height="30"></img>
</td>
</tr>
<tr>
<td colspan=3 align=center>
<input type="submit" name="submit" value="登录"/>
<input type="reset" name="reset" value="重置"/>
<a href="register.php">注册</a>
</td>
</tr>
</table>
</form>
注册页：register.php
<?php
include("conn.php");
if(isset($_POST['submit'])&&$_POST['submit']) {
if($_POST['username']=='')
{
echo "用户名不能为空";
exit();
}
if($_POST['password']=='')
{
echo "密码不能为空";
exit();
}
if($_POST['realpass']!=$_POST['password'])
{
echo "两次密码输入不一致";
exit();
}
$sql="insert into member(username,real_name,password,email,headimg) values('$_POST[username]','$_POST[username]','$_POST[password]','$_POST[email]','')";
$ar=mysql_query($sql);
if($ar)
{
header("location:index.php");
}
else
{
echo mysql_error();
}
}
?>
<body>
<form action="register.php" method="post">
<table border=1 align=center width=500>
<tr>
<td height=40 bgColor=#DFFFDF colspan=2>会员注册 [<a href="login.php">返回登录页</a>]</td>
</tr>
<tr>
<td height=40 bgColor=#fffbec >会员ID</td>
<td><input type="text" name="username" id="username"/></td>
</tr>
<tr>
<td height=40 bgColor=#fffbec>密码</td>
<td><input type="password" name="password" id="password"/></td>
</tr>
<tr>
<td height=40 bgColor=#fffbec>确认密码</td>
<td>
<input type="password" name="realpass" id="realpass"/>
</td>
</tr>
<tr>
<td height=40 bgColor=#fffbec>EMAIL</td>
<td><input type="text" name="email" id="email"/>
</tr>
<tr>
<td height=40 bgColor=#fffbec></td>
<td><input type="submit" name="submit" value="注册"/><input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
主页显示：index.php
<?php
include("conn.php");
function cutstr($str,$cutleng)
{
$str = $str; //要截取的字符串
$cutleng = $cutleng; //要截取的长度
$strleng = strlen($str); //字符串长度
if($cutleng>$strleng)return $str;//字符串长度小于规定字数时,返回字符串本身
$notchinanum = 0; //初始不是汉字的字符数
for($i=0;$i<$cutleng;$i++)
{
if(ord(substr($str,$i,1))<=128)
{
$notchinanum++;
}
}
if(($cutleng%2==1)&&($notchinanum%2==0)) //如果要截取奇数个字符，所要截取长度范围内的字符必须含奇数个非汉字，否则截取的长度加一
{
$cutleng++;
}
if(($cutleng%2==0)&&($notchinanum%2==1)) //如果要截取偶数个字符，所要截取长度范围内的字符必须含偶数个非汉字，否则截取的长度加一
{
$cutleng++;
}
return substr($str,0,$cutleng);
}
?>
<html>
<head>
<script type="text/javascript">
function All(e, itemName)
{
var aa = document.getElementsByName(itemName);
for (var i=0; i<aa.length; i++)
aa[i].checked = e.checked; //得到那个总控的复选框的选中状态
}
function Item(e, allName)
{
var all = document.getElementsByName(allName)[0];
if(!e.checked) all.checked = false;
else
{
var aa = document.getElementsByName(e.name);
for (var i=0; i<aa.length; i++)
if(!aa[i].checked) return;
all.checked = true;
}
}
</script>
</head>
<?php
include("conn.php");
if(isset($_POST['del']))
{
$mm = $_POST["selected"];
$id =implode(",",$mm);
$sql = "delete from forums where id in(".$id.")";
//echo $sql;
$result=mysql_query($sql);
echo $result?"删除成功":"删除失败";
}
?>
<table style="BORDER-BOTTOM-WIDTH: 1px; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=600 align=center border=1 bordercolor=#ddddff>
<tr align=middle>
<td height=40 bgColor=#DFFFDF colspan=3>论坛列表</td>
</tr>
<tr>
<td colspan=3><a href="login.php" style="float:right">[退出系统]</a><a href="add_forum.php" style="float:right">[添加论坛]</a></td>
<td></td>
</tr>
<tr align=middle>
<td height=40 bgColor=#DFFFDF width=80>状态</td>
<td height=40 bgColor=#DFFFDF>论坛</td>
<td height=40 bgColor=#DFFFDF>最后更新</td>
</tr>
<?php
$sql="select * from forums";
$result=mysql_query($sql);
$num=mysql_num_rows($result);
if($num>0)
{
while($row=mysql_fetch_array($result)){
?>
<tr align=middle>
<td bgColor=#fffbec><input type="checkbox" name="selected" value="1"/></td>
<td height=50 bgColor=#fffbec width=300>
<?php
echo "<div><a href=\"forums.php?F=".$row['ID']."\">".$row['forum_name']."</a></div>";
echo cutstr($row['forum_description'],24);//最多显示24个字节，12个字，多余部分用省略号代替
echo "……";
?>
</td>
<td height=50 bgColor=#fffbec><div><?php echo $row['last_post_time']."by".$row['last_post_author']?></div></td>
</tr>
<?php
}
}
else
{
echo "<tr bgColor=#fffbec><td colspan=3>对不起，论坛尚在创建中……</td></tr>";
}
?>
<tr>
<td colspan=3> <input type="checkbox" name="selected" value="1" onclick="All(this,'selected')"/>全选/不全选</td>
</tr>
<tr>
<td><input type="button" name="del" id="del" value="删除选中项"/>
<?php
?>
</td>
</tr>
</table>
</html>
数据库你就自己建，望采纳~
D. PHP 实现注册登录系统
其实楼主要的代码网上有很多。你没有给出具体要实现注册的信息，所以只找了这个代码。楼主可以根据具体情况自己修改代码。
①注册模块：
http://hi..com/oldjunren/blog/item/2709e606841fbfca7a894774.html
②登陆模块
http://hi..com/oldjunren/blog/item/79c827cf1e398c3eb700c871.html
③PHP 防范SQL注入漏洞http://hi..com/oldjunren/blog/item/6540b734b207be1691ef3961.html
希望楼主成功。