php:当从文件中读取具有不同静态变量值的相同类对象时,什么是静态类变量的行为?

时间:2014-02-03 20:48:35

标签: php file class variables static

以下是这个想法:我正在php中构建一个文件上传站点,其中用户的记录作为User类的对象数组存储在一个平面文件中。在User类的结构中,我将$ iUsers定义为静态变量,以便计算用户数,而无需单独的records_number文件。

实验:假设有一些第一位访客Joe注册,登录并执行操作。他的$ iUsers版本是1,因为他是唯一的用户。与此同时,其他游客也会注册。所以在Joe上传文件之后,ajax会触发update_user_activity函数,它会尝试读取records_file并更新它。

我的问题:从文件中读取对象的数组会发生什么? User :: $ iUsers是否保持不变,它是否获得文件的类静态变量(例如6,如果已经注册了5个访问者),或者获得了一些模糊的,未定义的值?

编辑: 这是所请求的类实现的示例:

class User {
// user details, username, password, e-mail
static private $iUsers=0;
public function __construct($usr, $pwd, $eml) {
    //initializes user details
    $iUsers++;
}

// reads records from records file and locks the records file
static private function read_records(&$arr) {
    //lock file?
    //if User::check_connected()(checks session var) update $arr for the current user
    //open REC_FILE
    //unserialize to $arr
    //close REC_FILE
}
// Updates records from records file to the given array
static private function update_records(&$arr) {
    //unlock file
    //open REC_FILE
    //serialize $arr to file
    //close REC_FILE
}

static private function unlock_records() {
    //unlock file
}

// update function
private function update_user_activity() {
    read_records($recs);
    foreach($recs as $cur) {
        if($cur->sUsername === $this->sUsername) {
            //stuff here (updates the $cur
            update_records($recs);
            return true;
        }
    }
    unlock_records();
    return false;
}
static public function register(&$usr, &$pwd, &$eml) {
    //$recs array of records
    read_records($recs);
    if(iUsers<MAX_USERS) {
        // loop through the records --- unlocks_records and returns error if same name or e-mail is found
        $newuser = new User($usr, $pwd, $eml);
        array_push($recs, $newuser);
        update_records($recs);
        return "success";
    }
    else {
        unlock_records();
        return "No capacity for new users!";
    }
}

// login function
static public function login(&$usr, &$pw) {
    //$recs array of records
    read_records($recs);
    if(User::$iUsers>0) {
        foreach($recs as $cur) {
            if($cur->check_matching($usr, $pw)) {
                if($cur->$bActivated) {
                    // logged in
                    // stuff
                    update_records($recs);
                    return $cur;   //return whatever is going to be stored in _SESSION array;
                }
                else {
                    unlock_records();
                    return "Your account is deactivated!";
                }
            }
        }
        unlock_records();
        return "The username or password provided is wrong.";
    }
    else {
        unlock_records();
        return "There are no users registered!"; // no users registered
    }
}

}

0 个答案:

没有答案