[英]providing a class with access to 2 other classes?
我有一个在网上找到的登录脚本,该脚本是用php4编写的,并尝试对其进行修改,使其符合php5。
我有4个类别:user,db,form,mailer
以下是我的用户类别的摘要
<?php
include("include/database.php");
include("include/mailer.php");
include("include/form.php");
include("constants.php");
class user
{
var $username; //Username given on sign-up
var $firstname;
var $lastname;
var $userid; //Random value generated on current login
var $userlevel; //The level to which the user pertains
var $time; //Time user was last active (page loaded)
var $logged_in; //True if user is logged in, false otherwise
var $userinfo = array(); //The array holding all user info
var $url; //The page url current being viewed
var $referrer; //Last recorded site page viewed
var $num_active_users; //Number of active users viewing site
var $num_active_guests; //Number of active guests viewing site
var $num_members; //Number of signed-up users
/**
* Note: referrer should really only be considered the actual
* page referrer in process.php, any other time it may be
* inaccurate.
*/
public function __construct(db $db, Form $form)
{
$this->database = $db;
$this->form = $form;
$this->time = time();
$this->startSession();
$this->num_members = -1;
if(TRACK_VISITORS)
{
/* Calculate number of users at site */
$this->calcNumActiveUsers();
/* Calculate number of guests at site */
$this->calcNumActiveGuests();
}
}
/**
* startSession - Performs all the actions necessary to
* initialize this session object. Tries to determine if the
* the user has logged in already, and sets the variables
* accordingly. Also takes advantage of this page load to
* update the active visitors tables.
*/
function startSession()
{
session_start(); //Tell PHP to start the session
/* Determine if user is logged in */
$this->logged_in = $this->checkLogin();
/**
* Set guest value to users not logged in, and update
* active guests table accordingly.
*/
if(!$this->logged_in)
{
$this->username = $_SESSION['username'] = GUEST_NAME;
$this->userlevel = GUEST_LEVEL;
$this->addActiveGuest($_SERVER['REMOTE_ADDR'], $this->time);
}
/* Update users last active timestamp */
else
{
$this->addActiveUser($this->username, $this->time);
}
/* Remove inactive visitors from database */
$this->removeInactiveUsers();
$this->removeInactiveGuests();
/* Set referrer page */
if(isset($_SESSION['url']))
{
$this->referrer = $_SESSION['url'];
}
else
{
$this->referrer = "/";
}
/* Set current url */
$this->url = $_SESSION['url'] = $_SERVER['PHP_SELF'];
}
}
我像这样调用数据库和表格
$db = new db($config);
$user = new User($db);
$form = new Form;
但是它抛出一个错误
Catchable fatal error: Argument 2 passed to user::__construct() must be an instance of Form, none given, called in C:\wamp\www\ecornwall3\include\user.php on line 900 and defined in C:\wamp\www\ecornwall3\include\user.php on line 30
但是我不确定为什么。 如果我从构造函数中删除表单$ form,它可以正常工作,但是我需要访问表单类
为什么很容易。 您的构造函数说:
public function __construct(db $db, Form $form)
这意味着您必须给它两件事: db
类和Form
类。
您称之为:
$user = new User($db);
那没有Form
,而这正是您错误所言。 如果从构造函数中删除Form
,您将不再期望它,因此不会出现错误,但是您没有正确的功能。
您应该做的是将参数添加到构造函数调用中:
$user = new User($db, $form);
您没有为User::__construct()
构造函数提供足够的参数。 看一下声明:
public function __construct(db $db, Form $form)
它需要(声明)两个参数: db
类的实例和Form
类的实例。
尝试这个:
$db = new db($config);
$form = new Form;
$user = new User($db, $form);
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