会话仅在数组中存储一项

Question

我是 php 新手，我有一个注册表单，我想将注册的用户存储在数组或 JSON 中， 我建立了用户类，当我注册一个新用户时，我想将它添加到这个数组或 JSON 中，但是会话数组只接受一个用户，当我添加新用户会话时删除旧用户并存储新用户！ 这是我的代码：

class User
{
        private $id;
        private $first_name;
        private $last_name;
        private $email;
        private $password;
    
        public function register($id, $firstName, $lastName, $email, $password)
        {
            $this->id = $id;
            $this->first_name = stripslashes($firstName);
            $this->last_name = stripslashes($lastName);
            $this->email = $email;
            $this->password = password_hash($password, PASSWORD_DEFAULT);
        }
    }



class DB
{
    public $users;

    public function __construct()
    {
        $this->users = [];
    }
}


<?php
$counter = 0;
$_SESSION['usersDB'] = new DB;

if (isset($_POST['submit'])) {
    $firstName = $_POST['firstName'];
    $lastName = $_POST['lastName'];
    $email = $_POST['email'];
    $password = $_POST['password'];
    $user = new User;
    $user->register(++$counter, $firstName, $lastName, $email, $password);
    array_push($_SESSION['usersDB']->users, $user);
}
echo '<pre>';
var_dump($_SESSION['usersDB']);
echo '</pre>';
?>

我应该怎么做才能将所有用户存储在一个地方？

Answer 1

每次运行脚本时，您都将会话变量替换为new DB。如果会话变量已设置，则不应这样做。

if (!isset($_SESSION['userdDB'])) {
    $_SESSION['usersDB'] = new DB;
}

此外，$counter 将始终为 1，因为您在脚本的开头设置了 $counter = 0;。您可以将其保存在会话变量中，但实际上没有必要。您可以使用：

$counter = count($_SESSION['usersDB']->users);

我不确定这是否能满足您的需求。每个浏览器会话都有自己的会话变量，因此每个用户将只有一个他们已注册的用户列表。会话变量也是临时的，所以它不是一个永久保存注册用户列表的好方法。

保存永久用户列表的正确方法是在服务器上的数据库中。

Answer 2

将 cookies 与 serialize 和 unserialize 功能结合使用

user.php

<?php
class User
{
    public static $cnt = 0;
    private $id;
    private $name;
    public function __construct($name='')
    {
        self::$cnt++;
        $this->id = self::$cnt;
        $this->name = stripslashes($name);
    }
    public function __get($name){
        return $this->$name;
    }
    public function __set($name,$val){
        $this->$name = stripslashes($val);
    } 

    public function __toString(){
        return 'user('.$this->id.", ".$this->name.")";
    }
}
?>

db.php

<?php
class DB
{
    public $users = [];
    public function __construct()
    {
        $this->users = [];
    }

    public function __toString()
    {
        $str = "<ul>";
        foreach ($this->users as $user)
            $str .="<li>".$user."</li>";
        $str .= "</ul>";
        return $str;
    }
}
?>

index.php

<?php
require_once('user.php');

$user1 = new User('Steve');
$user2 = new User('Everst');

require_once('db.php');
$databse = new DB();

$databse->users[] = $user1;
$databse->users[] = $user2;

setcookie('users', serialize($databse),time() + 3600,"/","",0);
echo $_COOKIE['users'];
?>

users.php

<?php
require_once('db.php');
require_once('user.php');
$databse = unserialize($_COOKIE['users']);
echo $databse;
?>

Answer 3

将 session 与 JSON

结合使用

1. 实现接口JsonSerializable
2. 重写方法jsonSerialize

user.php

<?php
class User implements JsonSerializable
{
    public static $cnt = 0;
    private $id;
    private $name;
    public function __construct($name='')
    {
        self::$cnt++;
        $this->id = self::$cnt;
        $this->name = stripslashes($name);
    }
    public function __get($name){
        return $this->$name;
    }
    public function __set($name,$val){
        $this->$name = stripslashes($val);
    } 

    public function __toString(){
        return 'user('.$this->id.", ".$this->name.")";
    }

    public function jsonSerialize() {
        return array(
             'id' => $this->id,
             'name' => $this->name
        );
    }
}
?>

index.php

<?php
session_start();

include('user.php');
include('db.php');

$user1 = new User('Steve');
$user2 = new User('Everst');
$databse = new DB();
$databse->users[] = $user1;
$databse->users[] = $user2;

$_SESSION['database'] = JSON_encode($databse);//{"users":[{"id":1,"name":"Steve"},{"id":2,"name":"Everst"}]}

?>

users.php

<?php
session_start();
$databse = json_decode($_SESSION['database']);
foreach ($databse->users as $user)
    echo $user->id." - ".$user->name."<BR>";
?>