How to implement simple password login in php

php method to implement simple password login: 1. Create login.html; 2. Create login.php; 3. Process user login information; 4. Set the default homepage index.php; 5. Create a logout page. Can.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How to achieve simple password login in php?

PHP implements the simplest login interface

This is the first complete minimal project on the road to learning PHP. Finally, I have seen it With the hope of doing a project, I specially made a record

Login interface:

html code (login.html):

<form action="login.php" method="post">
        <fieldset>
            <legend>用户登录</legend>
            <ul>
                <li>
                    <label>用户名:</label>
                    <input type="text" name="username">
                </li>
                <li>
                    <label>密   码:</label>
                    <input type="password" name="password">
                </li>
                <li>
                    <label> </label>
                    <input type="checkbox" name="remember" value="yes">7天内自动登录
                </li>
                <li>
                    <label> </label>
                    <input type="submit" name="login" value="登录">
                </li>
            </ul>
        </fieldset>
    </form>

login.php: (Login processing page)

<?php
    header(&#39;Content-type:text/html; charset=utf-8&#39;);
    // 开启Session
    session_start();

    // 处理用户登录信息
    if (isset($_POST[&#39;login&#39;])) {
        # 接收用户的登录信息
        $username = trim($_POST[&#39;username&#39;]);
        $password = trim($_POST[&#39;password&#39;]);
        // 判断提交的登录信息
        if (($username == &#39;&#39;) || ($password == &#39;&#39;)) {
            // 若为空,视为未填写,提示错误,并3秒后返回登录界面
            header(&#39;refresh:3; url=login.html&#39;);
            echo "用户名或密码不能为空,系统将在3秒后跳转到登录界面,请重新填写登录信息!";
            exit;
        } elseif (($username != &#39;username&#39;) || ($password != &#39;password&#39;)) {
            # 用户名或密码错误,同空的处理方式
            header(&#39;refresh:3; url=login.html&#39;);
            echo "用户名或密码错误,系统将在3秒后跳转到登录界面,请重新填写登录信息!";
            exit;
        } elseif (($username = &#39;username&#39;) && ($password = &#39;password&#39;)) {
            # 用户名和密码都正确,将用户信息存到Session中
            $_SESSION[&#39;username&#39;] = $username;
            $_SESSION[&#39;islogin&#39;] = 1;
            // 若勾选7天内自动登录,则将其保存到Cookie并设置保留7天
            if ($_POST[&#39;remember&#39;] == "yes") {
                setcookie(&#39;username&#39;, $username, time()+7*24*60*60);
                setcookie(&#39;code&#39;, md5($username.md5($password)), time()+7*24*60*60);
            } else {
                // 没有勾选则删除Cookie
                setcookie(&#39;username&#39;, &#39;&#39;, time()-999);
                setcookie(&#39;code&#39;, &#39;&#39;, time()-999);
            }
            // 处理完附加项后跳转到登录成功的首页
            header(&#39;location:index.php&#39;);
        }
    }
 ?>

index.php (Default home page):

<?php
    header(&#39;Content-type:text/html; charset=utf-8&#39;);
    // 开启Session
    session_start();

    // 首先判断Cookie是否有记住了用户信息
    if (isset($_COOKIE[&#39;username&#39;])) {
        # 若记住了用户信息,则直接传给Session
        $_SESSION[&#39;username&#39;] = $_COOKIE[&#39;username&#39;];
        $_SESSION[&#39;islogin&#39;] = 1;
    }
    if (isset($_SESSION[&#39;islogin&#39;])) {
        // 若已经登录
        echo "你好! ".$_SESSION[&#39;username&#39;].&#39; ,欢迎来到个人中心!<br>';
        echo "<a href=&#39;logout.php&#39;>注销</a>";
    } else {
        // 若没有登录
        echo "您还没有登录,请<a href=&#39;login.html&#39;>登录</a>";
    }
 ?>

logout.php Logout page

<?php
    header(&#39;Content-type:text/html; charset=utf-8&#39;);
    // 注销后的操作
    session_start();
    // 清除Session
    $username = $_SESSION[&#39;username&#39;];  //用于后面的提示信息
    $_SESSION = array();
    session_destroy();

    // 清除Cookie
    setcookie(&#39;username&#39;, &#39;&#39;, time()-99);
    setcookie(&#39;code&#39;, &#39;&#39;, time()-99);

    // 提示信息
    echo "欢迎下次光临, ".$username.&#39;<br>';
    echo "<a href=&#39;login.html&#39;>重新登录</a>";

 ?>

Successful login status:

If you check Automatically log in within 7 days, the login information will be saved in the local cookie file through Cookie and Session technology, and you will be logged in automatically within 7 days.

Logout page:

Several situations of login errors have been processed:

I learned PHP by myself by watching videos. I just started, this is my first small project, please don’t hit me with ‘\holding fists’

Recommended learning: "PHP Video Tutorial"

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