亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱

PHP開(kāi)發(fā)留言板教程之注冊(cè)功能

看下面的一段代碼

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>注冊(cè)</title>
    <style type="text/css">
        *{margin: 0px;padding: 0px;}
        body{
            background:#eee;}
        #div{width:300px;height:400px;
            background:#B1FEF9;margin:0 auto;margin-top:150px;
            border-radius:20px;}
        h3{margin-left:48px;padding-top:60px;}
        h4{margin-left:120px;padding-top:60px;font-size: 18px;}
        #cnt{width:280px;height:370px;margin-left:33px;padding-top:60px;}
        .sub1{
            width:70px;height:30px;border:1px solid #fff;
            background:#eee;margin-left:150px;margin-top:20px;}
    </style>
</head>
<body>
    <div id="div">
        <h4>會(huì)員注冊(cè)</h4>
        <div id="cnt">
            <form method="post" action="regin.php">
                用戶(hù)名:<input type="text" placeholder="請(qǐng)輸入用戶(hù)名" name="username">
                <br><br>
                密&nbsp;碼:<input type="password" placeholder="請(qǐng)輸入密碼" name="password">
                <br><br>
                <input type="submit" value="注冊(cè)" class="sub1">
            </form>
        </div>
    </div>
</body>
</html>

注冊(cè)頁(yè)面是提交到regin.php ,下面我們來(lái)分析一下

鏈接數(shù)據(jù)庫(kù),引入conn.php的文件

require_once('conn.php');//引入連接數(shù)據(jù)庫(kù)文件

我們?cè)趯?xiě)注冊(cè)的時(shí)候,如果數(shù)據(jù)庫(kù)已存在表單提交的信息,就應(yīng)該不讓其注冊(cè)了,例如:數(shù)據(jù)庫(kù)中已經(jīng)有了“張三”這個(gè)用戶(hù),注冊(cè)時(shí)再使用“張三”,這樣是不可取的,所以我們首先要獲取表單提交的信息,然后去數(shù)據(jù)庫(kù)查詢(xún),是否存在該信息,代碼如下:

????$name = $_POST['username'];
?? ?$pwd? = md5($_POST['password']);
?? ?$sql = "select * from user where username='$name'";
?? ?$info = mysql_query($sql);
?? ?$res = mysql_num_rows($info);

然后我們要對(duì) $res 進(jìn)行判斷,如果為真即為數(shù)據(jù)庫(kù)存在該信息,提示用戶(hù)已被注冊(cè)。為假,我們可以注冊(cè),把獲取的信息添加到數(shù)據(jù)庫(kù)

代碼如下:

if($res){
?? ??? ?echo "<script>alert('用戶(hù)已存在,請(qǐng)重新注冊(cè)');location.href='reg.php';</script>";
?? ?}else{
?? ??? ?$sql1 = "insert into `user` (username,password) values('$name','$pwd')";
?? ??? ?$result = mysql_query($sql1);
?? ??? ?if($result){
?? ??? ??? ?echo "<script>alert('注冊(cè)成功');location.href='message.php';</script>";
?? ??? ?}else{
?? ??? ??? ?echo "<script>alert('注冊(cè)失敗');location.href='reg.php';</script>";
?? ??? ?}
?? ?}


reg.php 完整代碼如下:

<?php
    require_once('conn.php');//引入連接數(shù)據(jù)庫(kù)文件
    //注冊(cè)
    $name = $_POST['username'];
    $pwd  = md5($_POST['password']);

    $sql = "select * from user where username='$name'";
    $info = mysql_query($sql);
    $res = mysql_num_rows($info);
    if($res){
        echo "<script>alert('用戶(hù)已存在,請(qǐng)重新注冊(cè)');location.href='reg.php';</script>";
    }else{
        $sql1 = "insert into `user` (username,password) values('$name','$pwd')";
        $result = mysql_query($sql1);
        if($result){
            echo "<script>alert('注冊(cè)成功');location.href='message.php';</script>";
        }else{
            echo "<script>alert('注冊(cè)失敗');location.href='reg.php';</script>";
        }
    }
?>


繼續(xù)學(xué)習(xí)
||
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>注冊(cè)</title> <style type="text/css"> *{margin: 0px;padding: 0px;} body{ background:#eee;} #div{width:300px;height:400px; background:#B1FEF9;margin:0 auto;margin-top:150px; border-radius:20px;} h3{margin-left:48px;padding-top:60px;} h4{margin-left:120px;padding-top:60px;font-size: 18px;} #cnt{width:280px;height:370px;margin-left:33px;padding-top:60px;} .sub1{ width:70px;height:30px;border:1px solid #fff; background:#eee;margin-left:150px;margin-top:20px;} </style> </head> <body> <div id="div"> <h4>會(huì)員注冊(cè)</h4> <div id="cnt"> <form method="post" action="regin.php"> 用戶(hù)名:<input type="text" placeholder="請(qǐng)輸入用戶(hù)名" name="username"> <br><br> 密 碼:<input type="password" placeholder="請(qǐng)輸入密碼" name="password"> <br><br> <input type="submit" value="注冊(cè)" class="sub1"> </form> </div> </div> </body> </html>
提交重置代碼