PHP函数don'；t返回数据。显示错误

您正在使用未定义变量的属性

$session

：

include("include/session.php");

    class createcountdown
        {
        public $start;
        public $howlong;
        public function get(){
        $this->start = $session->start; // $session->start Returns data from Mysql: 0000-00-00 00:00:00
        $this->howlong = $session->howlong; // $session->howlong Returns data from Mysql: 300
        $diff = $this->start-3600 + $this->howlong-time();

        if($this->start + $this->howlong > time()){
           list($h,$min,$sec)=explode(":",date("H:i:s",$diff));
           $sum = $this->start + $this->howlong-time();
           return $sum;
        }
    }

    $obj = new createcountdown();
    $result = $obj->get();
    echo $result;

---

如果是全局对象，则使用

global$session问题似乎是
get（）
中的
if
之后缺少大括号

当我在
list（$h，$min，$sec）=explode（“：”，date（$h:I:s“，$diff））之后添加大括号时，代码运行时没有错误。
请关闭类
}
运算符丢失

$this->start = $session->start;
$this->howlong = $session->howlong;

您可以尝试以下方法：

include("include/session.php");

    class createcountdown
        {
        public $start;
        public $howlong;
        public function get(){
        $this->start = $session->start; // $session->start Returns data from Mysql: 0000-00-00 00:00:00
        $this->howlong = $session->howlong; // $session->howlong Returns data from Mysql: 300
        $diff = $this->start-3600 + $this->howlong-time();

        if($this->start + $this->howlong > time()){
           list($h,$min,$sec)=explode(":",date("H:i:s",$diff));
           $sum = $this->start + $this->howlong-time();
           return $sum;
        }
    }
 }

    $obj = new createcountdown();
    $result = $obj->get();
    echo $result;

解析错误：解析错误，第24行的cd.php中应为'T_FUNCTION'，您似乎忘记关闭类声明的
}
@Alex JL为您补充这一点，它缺少一个右括号。当我将这段代码粘贴到解释器中并添加大括号时，我得到“Parse error:syntax error，unexpected T_变量，在第17行的php shell代码中需要T_函数”是的，大括号应该放在哪里？它似乎在
get（）
中的
if
之后丢失了。好的，但我必须放置在哪里：global$session？将其作为get（）函数的第一行。注意：未定义变量：第11行中的会话试图获取第12行中非对象的属性class createcountdown{global$session；分析错误，第6行中应为'T_function'：class createcountdown{global$session；class createcountdown{public$start；public$howlong；公共函数get（）{global$session；
include("include/session.php");

    class createcountdown
        {
        public $start;
        public $howlong;
        public $session; // add 
        public function get(){
       // $this->start = $session->start; // $session->start Returns data from Mysql: 0000-00-00 00:00:00
         $this->start = $this->session->start; // change here
        // $this->howlong = $session->howlong; // $session->howlong Returns data from Mysql: 300
        $this->howlong = $this->session->howlong; // change here

        $diff = $this->start-3600 + $this->howlong-time();

        if($this->start + $this->howlong > time()){
           list($h,$min,$sec)=explode(":",date("H:i:s",$diff));
           $sum = $this->start + $this->howlong-time();
           return $sum;
        }
    }
 }

    $obj = new createcountdown();
    $obj->session = $session // which is globaly define
    $result = $obj->get();
    echo $result;