Namespace Autoload works under windows, but not on Linux - php

Question

I have the following php code:
index.php
<?php
spl_autoload_extensions(".php");
spl_autoload_register();
use modules\standard as std;
$handler = new std\handler();
$handler->delegate();
?>
modules\standard\handler.php
<?php
namespace modules\standard {
class handler {
function delegate(){
echo 'Hello from delegation!';
}
}
}
?>
Under Windows 7, running WAMP, the code produces the message "Hello from Delegation!" however under Linux, I get the following:
Fatal error: spl_autoload(): Class modules\standard\handler could not be loaded in /var/www/index.php on line 15
Windows is running PHP 5.3.0 under WAMP, and Linux is running the 5.3.2 dotdeb package under Ubuntu 9.10.
Is this a configuration issue on my linux box, or just a difference in the way namespaces and autoloading is handled on the different operating systems

Answer 1

The SPL autoloader is extremely primitive - it has no knowledge of namespaces, so it tries to load a file with \ in it's name while on Linux/Unix the path separator is / not .

Answer 2

Herman Radtke says he has submitted a patch :
http://www.hermanradtke.com/blog/hidden-features-with-spl_autoload-and-namespaces/
:s
I'm hoping it'll be implemented soon.
For now I use this workaround :
<?php
set_include_path( './classes/' . PATH_SEPARATOR . get_include_path() );
spl_autoload_extensions( '.php , .class.php' );
spl_autoload_register();
function linux_namespaces_autoload ( $class_name )
{
/* use if you need to lowercase first char *
$class_name = implode( DIRECTORY_SEPARATOR , array_map( 'lcfirst' , explode( '\\' , $class_name ) ) );/* else just use the following : */
$class_name = implode( DIRECTORY_SEPARATOR , explode( '\\' , $class_name ) );
static $extensions = array();
if ( empty($extensions ) )
{
$extensions = array_map( 'trim' , explode( ',' , spl_autoload_extensions() ) );
}
static $include_paths = array();
if ( empty( $include_paths ) )
{
$include_paths = explode( PATH_SEPARATOR , get_include_path() );
}
foreach ( $include_paths as $path )
{
$path .= ( DIRECTORY_SEPARATOR !== $path[ strlen( $path ) - 1 ] ) ? DIRECTORY_SEPARATOR : '';
foreach ( $extensions as $extension )
{
$file = $path . $class_name . $extension;
if ( file_exists( $file ) && is_readable( $file ) )
{
require $file;
return;
}
}
}
throw new Exception( _( 'class ' . $class_name . ' could not be found.' ) );
}
spl_autoload_register( 'linux_namespaces_autoload' , TRUE , FALSE );
?>

Answer 3

function __autoload($class_name) {
$paths[] = dirname(__FILE__) . "/../libs/misc/";
$paths[] = dirname(__FILE__) . "/../../libs/misc/";
$paths[] = dirname(__FILE__) . "/../../libs/helpers/";
$paths[] = dirname(__FILE__) . "/../../libs/simpleimage/";
foreach($paths as $path)
{
if(file_exists($path.strtolower($class_name).'.class.php')){
require_once($path.strtolower($class_name).'.class.php');
}
}
}

Answer 4

function __autoload($class_name)
{
$class_name = strtolower(str_replace('\\', DIRECTORY_SEPARATOR, $class_name));
include $class_name . '.php';
}
The srttolower is needed on Apache because it is (contrary to IIS) case sentive.

Answer 5

This is a common problem occurs when autoloading. The fix is to use DIRECTORY_SEPARATOR constant in the autoload function.
So your autoload function will look like following
<?php
spl_autoload_register(function($className) {
$className = str_replace("\", DIRECTORY_SEPARATOR, $className);
include_once $_SERVER['DOCUMENT_ROOT'] . '/class/' . $className . '.php';
});
If you need to learn more on namespace/class autoloading visit here
Thanks.