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/**
 * µÇ¼ÑéÖ¤
 */
public function login(){
    $username = I('post.username');
    $password = I('post.password');
    $user = M('User')->where(array('username'=>$username))->find();
    if (!$user) {
        $this->error('Óû§²»±£´æ£¡');
    }elseif(md5($password.$user['salt']) !== $user['password']){
        $this->error('ÃÜÂë¹ýʧ£¡');
    }else{
        // ÅжÏÓû§ÊÇ·ñÒѾ­µÇ¼
        $uid = $user['id']; // »ñÈ¡Óû§ID
        $session_uid = session('uid'); // ´ÓSessionÖлñÈ¡Óû§ID
        $session_sid = session('sid'); // ´ÓSessionÖлñÈ¡µÇ¼±êʶ·û
        if($uid == $session_uid && $session_sid){ // ÅжÏÓû§ÊÇ·ñÒѾ­µÇ¼
            $this->error('ÄúÒѾ­ÔÚÆäËûÉè±¹ØÁ¬Ç¼£¬ÇëÏÈÍ˳öÆäËûµÄµÇ¼»á»°£¡');
        }else{
            // ÌìÉúеÄÉí·Ý±êʶ·û
            $sid = md5(uniqid(mt_rand(), true)); // ÌìÉúËæ»ú×Ö·û´®×÷ΪÉí·Ý±êʶ·û
            session('uid', $uid); // ½«Óû§ID´æ´¢µ½SessionÖÐ
            session('sid', $sid); // ½«µÇ¼±êʶ·û´æ´¢µ½SessionÖÐ
            $this->success('µÇ¼Àֳɣ¡');
        }
    }
}

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