本篇文章主要介绍PHP怎么写登录和注册页面,感兴趣的朋友参考下,希望对大家有所帮助。

登陆界面 login.php

<form action="logincheck.php" method="post"> 用户名:<input type="text" name="username" /> <br /> 密码:<input type="password" name="password" /> <br /> <input type="submit" name="submit" value="登陆" /> <a href="register.php">注册</a> </form>

登录处理界面 logincheck.php

<?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

<form action="regcheck.php" method="post"> 用户名:<input type="text" name="username"/> <br/> 密 码:<input type="password" name="password"/> <br/> 确认密码:<input type="password" name="confirm"/> <br/> <input type="Submit" name="Submit" value="注册"/> </form>

注册处理界面 regcheck.php

<?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>"; } ?>

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