PHP制作用户注册系统，php制作用户注册
到目前为止，你已经了解了足够多的PHP了。该写个小程序练手了。
用户注册系统
写一个index.php页面，有用户名和密码表单，post提交到check.php，输出用户名和"用户名+密码"的md5值
本地建立一个mysql数据库，名叫segmentfault，建立一个表user，字段username password将上题check.php接收到的内容存入
我们先完成HTML部分：
<!DOCTYPE HTML> <html> <head> <title>注册</title> </head> <body> <h1 id="注册">注册</h1> <form action="check.php" enctype="application/x-www-form+xml" method="post"> <p> <label for="name">邮箱</label> <input name="name" required type="email" placeholder="请填写有效邮箱"></input> </p> <p> <label for="passphrase">密码</label> <input name="passphrase" required type="passphrase"></input> </p> <p> <input type="submit" value="提交"></input> </form> </body> </html>
注意，HTML5对表单的支持比以往版本的HTML好很多，可以直接指明各种type。比如制定了type="email"，会检验用户提交的邮件地址是否合法。
然后是check.php。
<!DOCTYPE> <html> <head> <title> 注册成功！</title> </head> <body> <h1 id="哇咔咔-你已经注册成功啦"> 哇咔咔，你已经注册成功啦！</h1> <p>呃……不过注册成功了好像也没什么用，因为本网站除了注册以外好像没有其他功能。</p> <p>那么，作为补偿，我会告诉你，你的“邮箱+密码”的md5值。</p> <p>你的邮箱是：
下面是PHP部分，直接嵌入HTML，这是PHP的优势：
<?php $username = htmlspecialchars($_POST["name"]); echo $username; ?> </p> <p>你的“邮箱+密码”的md5值是： <?php $passphrase = htmlspecialchars($_POST["passphrase"]); $md5sum = md5($username . $passphrase); echo $md5sum;
注意我们用了htmlspecialchars，避免用户填入奇怪的东西。
然后是数据库操作，我们使用mysqli，（mysql已经废弃了，现在推荐用 mysqli，当然你也可以用 PDO。）
首先我们指明数据库的一些信息：
$db_server = "localhost"; $db_user = "db_user"; $db_pass = "password"; $db_name = "segmentfault";
连接到数据库，并且确保连接正常：
$conn = new mysqli($db_server, $db_user, $db_pass, $db_name);
if (mysqli_connect_errno()) {
trigger_error("Database connection failed: " . mysqli_connect_error(), E_USER_ERROR);
}
使用SQL语句创建表
复制代码 代码如下:$sql = "CREATE TABLE user(username CHAR(140), password CHAR(140))";
添加记录
复制代码 代码如下:mysqli_query($conn, "INSERT INTO user (username, password) VALUES ($username, $md5sum)");
手写SQL不太爽，实际应用中，框架会为你提供各种方便。
关闭数据库：
mysqli_close($conn); ?> </p> </body> </html>
好了，我们已经成功地写好了一个小应用，也顺带学习了如何访问 MySQL 数据库。今天就到这里了。
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