PHP uses session for login verification

1. Overview

Back-end language: php (native php is used, no framework is introduced)

Front-end style: Bootstrap

Main functions: Basic administrator functions. Ordinary users need to use administrators for unified management. Ordinary users can view statistical data, and administrator users can only log in to the administrator center to manage users.

(Related learning video tutorial sharing: php video tutorial)

2. Session usage

a. After successful login, you need to create and record session

<?php

    require "../DB/MySQLHelper.php";
    require "../BLL/UserBLL.php";
    $result = -1;
    if(count($_POST)!=2)
    {
        echo $result;
        return;
    }
    $name = $_POST["name"];
    $password = $_POST["password"];

    $helper = new MySQLHelper();
    $helper->InitMySQL();
    $level = SelectUserLevel($helper,$name,$password);
    if($level != -1)
    {
        $result = $level;
        session_start();
        $_SESSION["user"] = true;
        $_SESSION["name"]=$name;
        $_SESSION["pwd"]=$password;
    }
    echo $result;
?>

b. Other functional modules use the specific method of session to write a general php. Other modules first call this php to determine whether to log in before calling.

<?php
    $user = false;
    session_start();
    //  判断是否登陆
    if (isset($_SESSION["user"]) && $_SESSION["user"] === true) {
        echo "true";
    } 
    else {
        $_SESSION["user"] = false;
        echo "false";
    }

?>

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