PHP从另一个对象调用对象

Question

I've been programming mainly with JAVA and have written procedural programs in PHP, but now I'm try to write some OOP bases programs in PHP and I'm facing a problem. I've got two files , Zoo.php and Dog.php , each contains a class.

Dog.php:

<?php
class Dog {
     private $name;
     private $color;

     public function __construct($name,$color) {
         $this->name = $name;
         $this->color = $color;
     }

     public function getName(){
         return $this->name;
     }

     public function getColor(){
         return $this->color;
     }
}

And Zoo.php:

<?php

class Zoo {
    private $name;
    private $dogs;

    public function __construct($name) {
        $this->name = $name;
        $dogs = array();
    }

    public function addDog($dogName,$dogColor){
        $dog = new Dog($dogName,$dogColor);
        array_push($this->dogs,$dog);
    }

    public function getAllDogs(){
        var_dump($dogs);
    }
}

echo "start";
$z = new Zoo("test_zoo");
$z->addDog("blackie","black");
$z->getAllDogs();

The code above outputs :

Fatal error: Class 'Dog' not found in C:\wamp\www\Zoo.php on line 13

I'd like to know what's wrong with the code above and how creating an object instance within another object should be done in PHP. Thanks in advance.

Answer 1

I gues you are not including Dog class.

<?php
include "Dog.php";

class Zoo {
/* ... */
}

Or you can use autoloading to auto include any class by default.