PHP调用其他类的方法

在我的 php 项目中我创建了 4 个类

联系

class Mysqliconn {

   public $mysqli;  

   public function __construct(){
      include "dbconfig.php";
      $this->connect($host, $user, $password, $database, $charset);
   }

   public function connect (.....)
      $this->mysqli = new mysqli(......);
   }
}

UPLOAD

class Upload {

     private $db;

     public function __construct( Mysqliconn $db ) {
        $this->db = $db; 
     }

     public function getID($id) {
        echo $id;
     }
}

USERS

class Users {

 private $db;

      public function __construct( Mysqliconn $db ) {
          $this->db = $db; 
      }

      public function getName($name) {
      echo $name;
      }
}

CARS

class Cars {

     private $db;

     public function __construct( Mysqliconn $db ) {
            $this->db = $db; 
     }

     public function getCars($cars) {
        echo $cars;
     }
 }

在我的 php 页面中，我以这种方式实例化类

function __autoload($class_name) {
    if(file_exists('class/class.' . strtolower($class_name) . '.php')) {
        require_once('class/class.' . strtolower($class_name) . '.php'); 
    }
    else {
        throw new Exception("Unable to load $class_name.");
    }
}

$db = new Mysqliconn();
$up = new Upload($db);
$us = new Users($db);
$cs = new Cars($db);

$cs->getCars('BMW');
$us->getName('Foo');

在我的汽车类中，我想调用用户类和上传类的方法。 可以做吗？我怎么能这样做呢？谢谢。

class Example{

    public function __construct(){
        $otherClass = new OtherClass();
        $otherClass->functionInOtherClass();
    }

}

or

class Example{

    public function __construct($objFromOtherClass){
        $objFromOtherClass->functionInOtherClass();
    }

}

or

class Example{

    public function __construct(OtherClass $objFromOtherClass){
        $objFromOtherClass->functionInOtherClass();
    }

}

如果有问题的对象将在您的整个过程中使用Example class:

class Example{

    protected $objFromOtherClass;

    public function __construct(OtherClass $objFromOtherClass){
        $this->objFromOtherClass = $objFromOtherClass;
    }

    public function test(){
        $this->objFromOtherClass->functionInOtherClass();
    }

}