<?php

class users {

    public $_username, $_password;

    public function  __construct() {
    if(isset($_SESSION['username']) && isset($_SESSION['password']))
        $this->log_ind($_SESSION['username'], $_SESSION['password']);
        else $this->log_ud();
    }

    public function logget_ind() {
    if(isset($this->_username) && isset($this->_password))
        $result = true;
    elseif(isset($_SESSION['username']) && isset($_SESSION['password']))
        $result = true;
    else
        $result = false;

    return $result;
    }

    public function log_ind($username, $pass) {
    $password = sha1($pass);
    if($this->check_user($username, $password)) {
        $this->_username = $username;
        $this->_password = $password;
        $_SESSION['username'] = $this->_username;
        $_SESSION['password'] = $this->_password;
        $result = true;
    } else {
        $this->log_ud();
        $result = false;
    }
    return $result;
    }

    private function check_user($username, $password) {
    $query = mysql_query("SELECT * FROM `users` WHERE `email` = '{$username}' AND `password` = '{$password}'");
    mysql_num_rows($query) != 0 ? $result = true : $result = false;
    return $result;
    }

    public function log_ud() {
    unset($this->_username);
    unset($this->_password);
    unset($_SESSION['username']);
    unset($_SESSION['password']);
    return true;
    }
}