PHP autoloader not working with namespaces - php

Question

Its the first time working with an autoloader and getting some errors.
The structure is as follows:
AnimalShop (root)
classes
Shop.php
index.php
I have the following simple code
Index.php
<?php
spl_autoload_register(function ($class_name)
{
include $class_name . '.php';
});
echo "<h1>PETs SHOP</h1>";
// Create a shop
$shop = new Shop();
Shop is a simple class
<?php
namespace PHPAdvanced\AnimalShop\classes;
/*
* Pet shop
*/
class Shop
{
/**
* #var Pets[] pets
*/
private $pets = [];
public function addPetsToArray(Pets $pet)
{
$this->pets[] = $pet;
}
/**
* Print pets naam
*/
public function printPets()
{
foreach($this->pets as $pet)
{
echo "<p>" . $pet->getPetNaam() . "</p>";
}
}
}
When i run index.php i get the following errors:
Warning: include(Shop.php): failed to open stream: No such file or directory in /var/www/phpadvancedCourse/AnimalShop/index.php on line 4
Warning: include(): Failed opening 'Shop.php' for inclusion (include_path='.:/usr/share/php:') in /var/www/phpadvancedCourse/AnimalShop/index.php on line 4

Answer 1

spl_autoload_register(function ($class_name)
{
include realpath(dirname(__FILE__))."/classes/".$class_name . '.php';
});
your path is wrong.. try this..

Answer 2

To solve the problem i have used PSR-4 autoloading through composer with the following structure and code.
Structure
AnimalShop (root)
index.php
App (Folder)
Behavior (Folder)
WalkBehavior.php (interface)
Pets(Folder)
Cat.php
Dog.php
Fish.php
Pets.php (abstract class)
Shop(Folder)
PetShop.php
Composer.json
{
"autoload" : {
"psr-4" : {
"App\\" : "App"
}
}
}
index.php
<?php
// Autoload
require "vendor/autoload.php";
use App\Shop\PetShop;
use App\Pets\Dog;
use App\Pets\Fish;
use App\Pets\Cat;
echo "<h1>PETs SHOP</h1>";
// Create a shop
$shop = new PetShop();
$shop->addPetsToArray(new Dog("Yuki"));
$shop->addPetsToArray(new Fish("BLubie"));
$shop->addPetsToArray(new Cat("Cattie"));
$shop->printPets();
Example of Petshop and Dog
<?php
namespace App\Shop;
use App\Pets\Pets;
/*
* Pet shop
*/
class PetShop
{
/**
* #var Pets[] pets
*/
private $pets = [];
public function addPetsToArray(Pets $pet)
{
$this->pets[] = $pet;
}
/**
* Print pets naam
*/
public function printPets()
{
foreach($this->pets as $pet)
{
echo "<p>" . $pet->getPetNaam() . "</p>";
}
}
}
DOG
<?php
namespace App\Pets;
/**
* Class Dog
*/
class Dog extends Pets
{
/**
* Dog constructor.
*
* #param $name
*/
public function __construct(string $name)
{
parent::__construct($name);
}
public function walk() : string
{
return "Dog is walking";
}
}