Namespaces and Class loading in php - php

Question

I'm new to namespaces in PHP and trying to make use of them to load classes.
Whenever I run my code I get class Cheese cannot be found on line x
PHPstorm recognizes the class via the namespaces and enables its methods.
I have the following files / directory structure.
/Project
/App
Mouse.php
/Test
MouseTest.php
Mouse.php
namespace App\Mouse;
class Cheese
{
}
MouseTest.php
namespace Test\MouseTest;
use \App\Mouse\Cheese as Cheese;
class CheeseTest
{
function test() {
$cheese = new Cheese();
$cheese->eat();
}
}

Answer 1

if you use composer or any autoloader that follow psr-0, then file name must same with class name, change Mouse.php to Cheese.php

Answer 2

This looks like a similar structure to the PSR0 standard found here: http://www.php-fig.org/psr/psr-0/
This is an example autoloader following that structure:
function autoload($className)
{
$className = ltrim($className, '\\');
$fileName = '';
$namespace = '';
if ($lastNsPos = strrpos($className, '\\')) {
$namespace = substr($className, 0, $lastNsPos);
$className = substr($className, $lastNsPos + 1);
$fileName = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
}
$fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
require $fileName;
}
spl_autoload_register('autoload');
The spl_autoload_register call registers the autoload function so when a class is instantiated, it will use your autoload function to retrieve the class definition.

Answer 3

PHP namespaces don't load classes automatically, you have to include their files.
To make it automatic (like you want) you have to make an autoloader which will load the classes depending on the namespaces that you want to use.
The best way to make this, is using composer: http://code.tutsplus.com/tutorials/easy-package-management-with-composer--net-25530
but I recommend to search "php auloader" in google