php-Empty()函数在OOP中不起作用

我有这段代码,我尝试检查$name是否为空.在过程样式中,一切都很好,但是在OOP中,空函数似乎不起作用.我对PHP的经验不是很丰富,所以请解释问题出在哪里以及如何解决.

 <?PHP
    // The code below creates the class
    class Check {
        // Creating some properties (variables tied to an object)
        public $name;
        public $subject;

        // Assigning the values
        public function __construct($name, $subject) {
        $this->name=$name;
        $this->subject=$subject;
        }

        // Creating a method (function tied to an object)
        public function checking() {
         if (empty($name)) {
            echo "empty name";
         }
         else {
            echo "name set";
         }
        }
      }

    $me = new Check('Mark','somesubject');
    echo $me->checking();
    ?>

解决方法:

您应该使用：

if (empty($this->name)) {