Configure Namespace and autoload PSR-0

Question

I am developing a project with the following structure:

The goal is to make autoload load the classes.

The archive autoload.php:

 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');

Abstract class Person

namespace Projeto\Cliente;

use  Projeto\Cliente\Interfaces\ClienteEnderecoInterface;
use  Projeto\Cliente\Interfaces\ClienteImportanciaInterface;

abstract  class Pessoa implements ClienteEnderecoInterface, ClienteImportanciaInterface{}

Interface Clienteenderecointerface

namespace Projeto\Cliente\Interfaces;
interface ClienteEnderecoInterface {}

Customer interface

namespace Projeto\Cliente\Interfaces;
interface ClienteImportanciaInterface {}

Classe Clientepf

namespace Projeto\Cliente\Tipos;
use Projeto\Cliente\Pessoa;
class ClientePF extends Pessoa{}

Classe Clientepj

namespace Projeto\Cliente\Tipos;
use Projeto\Cliente\Pessoa;
class ClientePJ extends  Pessoa {}

Index.php

require_once('./inc/autoload.php');
  $cli = new ClientePF();
  $cli2 = new ClientePJ()

When trying to load the index, php the system informs that it cannot locate the classes:

( ! ) Warning: require(ClientePF.php): failed to open stream: No such file or directory in C:\wamp\www\inc\autoload.php on line 15 Call
Stack
# Time    Memory  Function    Location 1  0.0010  152944  {main}( ) ...\index.php:0 2 0.0030  157944  spl_autoload_call (
) ...\index.php:33 3  0.0030  158000  autoload( ) ...\index.php:33

What should be the correct way to declare namespaces and autoload? Full Code can be downloaded here: Github Given the success of psr-4, I can use it to replace psr-0

Answer 1

The PSR-0 other than the PSR-4 supports both _ how much \ to refer to namespaces, of course _ is a namespace simulation that was used until php5.2.

The PSR-0 is out of use as a recommendation, however there are still older libs maintained that use the underscore, to make the simple autoload that follows the PSR-4 would suffice something as explained in this reply /a/91512/3635, take the example:

<?php
function myAutoLoader($class)
{
    // Diretório aonde ficam as bibliotecas
    $base_dir = __DIR__ . '/../src/'; //A sua pasta `/src`

    //Transforma namespace no caminho do arquivo
    $file = $base_dir . str_replace('\\', '/', $np) . '.php';

    // Verifica se o arquivo existe, se existir então inclui ele
    if (is_file($file)) {
        include_once $file;
    }
}

spl_autoload_register('myAutoLoader');

But it is possible to adapt to accept classes with underscore (underline _), thus:

<?php
function myAutoLoader($class)
{
    $separador = '_';

    //Verifica se usa \\ como separador
    if (strpos($classname, '\\') !== false) {
        //Corrige problema no PHP5.3
        $classname = ltrim($classname, '\\');

        $separador = '\\';
    }

    // Diretório aonde ficam as bibliotecas
    $base_dir = __DIR__ . '/../src/'; //A sua pasta `/src`

    //Transforma namespace (sendo com \ ou _) no caminho do arquivo
    $file = $base_dir . str_replace($separador, '/', $np) . '.php';

    // Verifica se o arquivo existe, se existir então inclui ele
    if (is_file($file)) {
        include_once $file;
    }
}

spl_autoload_register('myAutoLoader');

In case I used __DIR__ . '/../src/' to move up a level of the folder inc, because I believe you will use in the index

About your code:

1. In PHP for includes I don’t think it’s necessary DIRECTORY_SEPARATOR, in all distros and operating systems that surround perfectly accept /
2. I didn’t use require, because the problem that should be issued is that of exception class not found, not tested require, but it causes script termination if it does not find the file, which will give an expected error as per the PSR-4 recommendations

Documentation:

• PSR-0: http://www.php-fig.org/psr/psr-0/
• PSR-4: http://www.php-fig.org/psr/psr-4/

Some links that questions and answers on the subject:

• What is spl_autoloader_register in PHP?
• PSR-4 in an MVC project or not?
• What are the differences between __autoload and spl_autoload_register?
• What does PSR mean?
• Autoload PSR4 class