Use PHP to implement user login and registration functions

Use PHP to realize the user login and registration functions. I believe many students can write and use PHP to realize the login and registration functions. Here are some For those new PHP programmers, I will show you the way.

Login interface 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>

Login processing interface logincheck.php

<?php  
    if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")  
    {  
        $user = $_POST["username"];  
        $psw = $_POST["password"];  
        if($user == "" || $psw == "")  
        {  
            echo "<script>alert(&#39;请输入用户名或密码！&#39;); history.go(-1);</script>";  
        }  
        else  
        {  
            mysql_connect("localhost","root","sixx");  
            mysql_select_db("vt");  
            mysql_query("set names &#39;gbk&#39;");  
            $sql = "select username,password from user where username = &#39;$_POST[username]&#39; and password = &#39;$_POST[password]&#39;";  
            $result = mysql_query($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(&#39;用户名或密码不正确！&#39;);history.go(-1);</script>";  
            }  
        }  
    }  
    else  
    {  
        echo "<script>alert(&#39;提交未成功！&#39;); history.go(-1);</script>";  
    }  
  
?>

Registration interface 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>

Registration processing interface regcheck.php

<?php  
    if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")  
    {  
        $user = $_POST["username"];  
        $psw = $_POST["password"];  
        $psw_confirm = $_POST["confirm"];  
        if($user == "" || $psw == "" || $psw_confirm == "")  
        {  
            echo "<script>alert(&#39;请确认信息完整性！&#39;); history.go(-1);</script>";  
        }  
        else  
        {  
            if($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 &#39;gdk&#39;"); //设定字符集  
                $sql = "select username from user where username = &#39;$_POST[username]&#39;"; //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(&#39;用户名已存在&#39;); history.go(-1);</script>";  
                }  
                else    //不存在当前注册用户名称  
                {  
                    $sql_insert = "insert into user (username,password,phone,address) values(&#39;$_POST[username]&#39;,&#39;$_POST[password]&#39;,&#39;&#39;,&#39;&#39;)";  
                    $res_insert = mysql_query($sql_insert);  
                    //$num_insert = mysql_num_rows($res_insert);  
                    if($res_insert)  
                    {  
                        echo "<script>alert(&#39;注册成功！&#39;); history.go(-1);</script>";  
                    }  
                    else  
                    {  
                        echo "<script>alert(&#39;系统繁忙，请稍候！&#39;); history.go(-1);</script>";  
                    }  
                }  
            }  
            else  
            {  
                echo "<script>alert(&#39;密码不一致！&#39;); history.go(-1);</script>";  
            }  
        }  
    }  
    else  
    {  
        echo "<script>alert(&#39;提交未成功！&#39;); history.go(-1);</script>";  
    }  
?>

The above is the function of using PHP to register and log in, for PHP programmers who are just getting started. More good articles and video tutorials about PHP are available at PHP中文网! I wish you will become a great person soon!

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