php - 在依赖注入里如何进行多组件间的调用

Question

<?php

class Classroom{
    public $room = [];
    function addTeacher($teacher){
        $this->room['teacher'] = $teacher;
    }
    function addStudents($student){
        $this->room['student'] = $student;
    }
}

class Teacher{
    public $name='AAAA';
    public $room=[];
    function __construct($room){
        $this->room = $room;
    }
    function sayHello(){
        echo ' hello '.$this->room['student']->name.'  student '.PHP_EOL;
    }
}

class Student{
    public $name = 'BBB';
    public $room=[];
    function __construct($room){
        $this->room = $room;
    }
    function sayHello(){
        echo ' hello '.$this->room['teacher']->name. ' teacher '.PHP_EOL;
    }
}

$Classroom = new Classroom;
$Classroom->addTeacher( new Teacher($Classroom->room) );
$Classroom->addStudents( new Student($Classroom->room) );

$Classroom->room['teacher']->sayHello();
$Classroom->room['student']->sayHello();

这里的老师是获取不到学生名字的

我用容器将所有的应用组件包起来，然后，当应用组件之间调用的时候，就会有这样的问题。

前面注册进去的应用组件无法调用后面注册的应用，但是后面注册的应用是可以调用前面的。

那么如果说，前面的要使用后面的应用，这个问题怎么解决呢？

Answer 1

  <?php
  
  class Classroom{
      public $room = [];
          function addTeacher($teacher){
              $this->room['teacher'] = $teacher;
          }
          function addStudents($student){
              $this->room['student'] = $student;
          }
  }
  
  class Teacher{
          public $name='AAAA';
          public $room=[];
          function __construct($room){
              $this->room = $room;
          }
          function sayHello(){
              echo ' hello '.$this->room->room['student']->name.'  sdent '.PHP_EOL;
          }
 }
 
 class Student{
         public $name = 'BBB';
         public $room=[];
         function __construct($room){
             $this->room = $room;
         }
         function sayHello(){
             echo ' hello '.$this->room->room['teacher']->name. ' teacher '.PHP_EOL;
         }
 }
 
 $Classroom = new Classroom;
 $Classroom->addTeacher( new Teacher($Classroom) );
 $Classroom->addStudents( new Student($Classroom) );
 
 $Classroom->room['teacher']->sayHello();
 $Classroom->room['student']->sayHello();