How to use PHP to implement a simple registration and login system (source code attached)

The previous article introduced to you "How to use PHP to solve high concurrency problems? (Source code attached) 》, this article continues to introduce to you how to use PHP to implement a simple registration and login system, let’s study together! ! !

The directory structure is as follows, where the function folder contains two function files, and the uploads folder is used to store uploaded files.

Note: The blogger is using php5. If friends who use php7 run and report errors, part of the reason is caused by the new syntax. Just modify it to the new syntax.

html page

Login page

index.html

Registration page

register. html

<h2>用户注册登录系统</h2>
<hr>

Function implementation file

Realize login function

login_process.php

<?php     include_once("function/database.php");
    // $userName = $_POST[&#39;userName&#39;];
    // $password = $_POST[&#39;password&#39;];
    $userName = addslashes($_POST[&#39;userName&#39;]);
    $password = addslashes($_POST[&#39;password&#39;]);
    getConnect();
    $loginSQL = "select * from users where userName=&#39;$userName&#39; and password=&#39;$password&#39;";
    echo $loginSQL;
    $resultLogin = mysql_query($loginSQL);
    if (mysql_num_rows($resultLogin) > 0) {
        echo "登录成功";
    } else {
        echo "登录失败";
    }
    closeConnect();
?>

Realize registration Function

register.php

<?php     include_once("function/fileSystem.php");
    include_once("function/database.php");

    if (empty($_POST)) {
        exit("您提交的表单数据超过post_max_size! <br>");
    }

    // 判断输入密码与确认密码是否相同
    $password = $_POST['password'];
    $confirmPassword = $_POST['confirmPassword'];
    if ($password != $confirmPassword) {
        exit("输入的密码与确认密码不相等！");
    }

    $userName = $_POST['userName'];
    $domain = $_POST['domain'];
    $userName = $userName . $domain;

    // 判断用户名是否重复
    $userNameSQL = "select * from users where userName = '$userName'";
    getConnect();
    $resultSet = mysql_query($userNameSQL);
    if (mysql_num_rows($resultSet) > 0) {
        exit("用户名已被占用，请更换其他用户名");
    }

    $sex = $_POST['sex'];
    if (empty($_POST['interests'])) {
        $interests = "";
    } else {
        $interests = implode(";", $_POST['interests']);
    }

    $remark = $_POST['remark'];
    $myPictureName = $_FILES['myPicture']['name'];

    $registerSQL = "insert into users values(null, '$userName', '$password', '$sex', '$interests', '$myPictureName', '$remark')";
    $message = upload($_FILES['myPicture'], "uploads");

    if ($message == "上传成功" || $message == "没有上传") {
        mysql_query($registerSQL);
        $userID = mysql_insert_id();
        echo "注册成功<br>";
    } else {
        exit($message);
    }

    $userSQL = "select * from users where user_id = '$userID'";
    $userResult = mysql_query($userSQL);
    if ($user = mysql_fetch_array($userResult)) {
        echo "您的注册用户名为：" . $user['userName'];
    } else {
        exit("用户注册失败！");
    }
    closeConnect();

Function file (function folder)

Function to realize database connection and closing

database.php

<?php     $databaseConnection = null;
    function getConnect() {
        $hosthome = "localhost";
        $database = "register";
        $userName = "root";
        $password = "123456";
        global $databaseConnection;
        $databaseConnection = @mysql_connect($hosthome, $userName, $password) or die (mysql_error());
        mysql_query("set names gbk");
        @mysql_select_db($database, $databaseConnection) or die (mysql_error());
    }
    
    function closeConnect() {
        global $databaseConnection;
        if ($databaseConnection) {
            @mysql_close($databaseConnection) or die (mysql_error());
        }
    }
?>

Function to implement file upload

fileSystem.php

<?php     function upload($file, $filePath) {
        $error = $file[&#39;error&#39;];
        switch ($error) {
            case 0:
                $fileName = $file[&#39;name&#39;];
                $fileTemp = $file[&#39;tmp_name&#39;];
                $destination = $filePath . "/" . $fileName;
                move_uploaded_file($fileTemp, $destination);
                return "上传成功";
            case 1:
                return "上传超过upload_max_filesize";
            case 2:
                return "上传文件超过form的MAX_FILE_SIZE";
            case 3:
                return "附件部分上传";
            case 4:
                return "没有上传";
        }
    }
    ?>

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