Question

我无法弄清楚程序无法正常工作的原因。我应该拿每个学生对象并使用assign_to_dorm函数并将它们添加到宿舍。然后使用view_occupants函数打印出数组中的所有占用者。所有程序都会迭代其中一个宿舍名称，并且对view_occupants不执行任何操作。我甚至不确定Assign_to_dorm函数是否正常工作

index.php文件

    <!DOCTYPE html>
     <html>
     <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>
    </head>
    <body>

<?php

        require_once ('student.class.php');
        require_once ('dorm.class.php');

        $dorms = array();
        $students = array();

        $dorms[0]= new Dorm('Landis', 402);
        $dorms[1]= new Dorm('Salley', 570);
        $dorms[2]= new Dorm('DeGraff', 700);
        $dorms[3]= new Dorm('Cawthon', 297);
        $dorms[4]= new Dorm('Reynolds', 243);



        $students[0] = new Student('Tim', 'James', 'senior', 'male');
        $students[1] = new Student('Kyle', 'McLastly', 'junior', 'male');
        $students[2] = new Student('Stacey', 'Keibler','senior','female');
        $students[3] = new Student('Jessica', 'Mullins', 'junior','female');
        $students[4] = new Student('Kenneth', 'Yagems','senior', 'male');
        $students[5] = new Student('Chad', 'Stacey', 'sophomore', 'male');
        $students[6] = new Student('Kyle', 'Bridgan', 'senior', 'male');
        $students[7] = new Student('Heath', 'Banks', 'sophomore', 'female');
        $students[8] = new Student('Christina', 'Burbanks', 'freshman', 'female');
        $students[9] = new Student('Thomas', 'Wilson', 'senior', 'male');
        $students[10] = new Student('Katy', 'Parks', 'junior', 'female');
        $students[11] = new Student('Jay', 'Bradshaw', 'sophomore', 'male');
        $students[12] = new Student('Laura', 'Demetri', 'freshman', 'female');
        $students[13] = new Student('Bryan', 'Griffin', 'freshman', 'male');
        $students[14] = new Student('Stuart', 'Griffin', 'senior', 'male');

        shuffle($students);


        foreach($students as $student){

            $key = array_rand($dorms);
            $dorm = $dorms[$key];
            $dorm->assign_to_dorm($student);

        }


        foreach ($dorms as $dorm){

                echo "<h3>".$dorm->get_dname()."</h3>";

                echo "<p>".$dorm->view_occupants()."</p>";

        }

        ?>
    </body>
  </html>

dorm.class.php文件

<?php

       require_once ('student.class.php');

     class Dorm
    {

     private  $dorm_name;
     private  $capacity;
     private  $occupants = array();



     public function __construct($dorm_name,$capacity) {

         $this->dorm_name = $dorm_name;
         $this->capacity = $capacity; 

    }


        public function assign_to_dorm($student){


           if(count($this->occupants) >= $this->capacity) {

             return FAlSE;
           }

          else{

               array_push($this->occupants, $student);


               return TRUE;

          }
       }

      function get_dname(){

          return $this->dorm_name;
       }

      function get_capacity(){

          return $this->capacity;
       }

      function view_occupants(){
          foreach($this->occupants as $resident){
           echo "<p>".$resident."</p>";
          }
        }

       }

  ?>

Answer 1

您的代码对我来说没问题，但我注意到Dorm::ocupants似乎是Student个对象的数组。当您在view_occupants()中迭代它时，您将直接回显对象。除非它调用__toString()魔术方法为echo生成输出，否则您将无法显示您想要的信息。

如果我的假设不正确，请同时发布student.class.php。

  function view_occupants(){
      foreach($this->occupants as $resident){

       // Instead of echoing out the $resident obj, echo out a name:
       echo "<p>".$resident->lastname."</p>";
      }
    }

Answer 2

嗯，我似乎无法发现你代码中的任何错误。除此之外，您回显 $ resident 这是一个对象，因此您必须回显其中一个属性，例如 name 。

尝试一下，如果它不能用于发布Students课程的代码，那么我可以尝试运行它。

将对象添加到数组 - assign_to_dorm函数

2 个答案: