Namespace and autoload error, How do I use PHP namespaces with autoload correctly?

Question

I want to autoload to use namespace in my classes but i get a error in the index.php

Error: Fatal error: Class 'foo\B' not found ...

Example:

directories skeleton:

  \var\www
      |_ foo
      |  |_ A.php
      |  |_ B.php
      |  
      |_ view
      |  |_ index.php

A.php

<?php

namespace foo;

class A {

   private $a;

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

}

B.php

<?php

namespace foo;

use foo\A;

class B extends A {

    private $b;

    public function __construct($a, $b) {
        parent::__construct($a);
        $this->b = $b;
    }   

}

And Index.php

<?php

use foo\B;

define('ROOT', __DIR__ . DIRECTORY_SEPARATOR);

$b = new B('s', 2);

function __autoload($classname) {
    $namespace = substr($classname, 0, strrpos($classname, '\\'));
    $namespace = str_replace('\\', DIRECTORY_SEPARATOR, $classname);
    $classPath = ROOT . str_replace('\\', '/', $namespace) . '.php';

    if(is_readable($classPath)) {
        require_once $classPath;
    }
}

This question is almost the same as this one: PHP autoload namespace but I include the index.php in other Folder and does not work.

If I put the same project but with the next directories skeleton, I don't get any error.

  \var\www
      |_ foo
      |  |_ A.php
      |  |_ B.php
      |  
      |_ index.php

The question is: Why if I put the index.php in a folder does not work?

Thanks

Plenka · Accepted Answer · 2014-04-09 19:00:20Z

1

That's because the ROOT constant is pointing to /var/www/view/, not /var/www/. It changes as you move index.php to a different directory.

You might want to take a look at the function set_include_path(). With that you can set multiple root directory definitions. You can then loose the ROOT constant altogether.

answered Apr 9, 2014 at 19:00

Plenka

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