Why can't I access php without logging in?

Why can’t I access php without logging in?

Sometimes some content on our website needs to be logged in to view. How to achieve this? , learn together.

1. The first is the login interface. After the user successfully logs in, set $_SESSION['islogin'] = true; to mark that the user has logged in.

login.php

<?php
    $username = $_POST[&#39;username&#39;];
    $password = $_POST[&#39;password&#39;];
    // 这里直接使用文本进行存储数据，推荐使用数据库
    $user = file_get_contents(&#39;./user.txt&#39;); //存放登录名和密码的文件  
    //user.txt 内容 admin 123456   //存放的格式可以随意改变
    //根据登录名密码的存放格式获取用户名和密码
    $user = explode(&#39; &#39;,$user);
    if($user[0] == $username && $user[1] == $password ){
        //登录名和密码正确 设置session 并跳转
        session_start(); //开启session
        $_SESSION[&#39;islogin&#39;] = true;
        header("Location: index.php");exit;
    }else{
        //登录名和密码错误 返回登录页
        header("Location: login.php");exit;
    }
?>

2. Home page file, determine whether $_SESSION['islogin'] exists. If it does not exist, there will be no login. Jump to the login interface

index.php

<?php
    session_start(); //开启session
    //判断登录时的session是否存在 如果存在则表示已经登录
    if(!$_SESSION[&#39;islogin&#39;]){
        // !$_SESSION[&#39;islogin&#39;]  表示不存在 回到登录页面
        header("Location: login.php");exit;
    }
    //已经登录后的其他业务逻辑处理代码
?>

3. This realizes functions that cannot be accessed without logging in.

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