Namespaces and Class loading in 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();
   } 

}

What kind of autoloader are you using?

Morgan
– Morgan

2015-04-20 18:49:10 +00:00
Commented Apr 20, 2015 at 18:49 — Morgan
– Morgan, Commented Apr 20, 2015 at 18:49

ghanbari · Accepted Answer · 2015-04-20 18:58:15Z

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

answered Apr 20, 2015 at 18:58

ghanbari

1,6293 gold badges16 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Devon Bessemer Over a year ago

I just noticed the Class was a different name than the file. I missed that, so yes, not quite PSR0 like I had thought.

Devon Bessemer · Accepted Answer · 2015-04-20 18:55:37Z

0

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.

answered Apr 20, 2015 at 18:55

Devon Bessemer

35.6k10 gold badges77 silver badges102 bronze badges

2 Comments

user3708645 Over a year ago

how would i use this. would i have to predict classes to autoload

Devon Bessemer Over a year ago

@user3708645, you don't have to predict classes. The autoload function is invoked with the className. From the class name, the PSR0 function discerns the location of the file to include. For example: App\Mouse\Cheese would look in App/Mouse/Cheese.php for the Cheese class.

Peter Badida · Accepted Answer · 2016-11-02 20:48:35Z

0

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

edited Nov 2, 2016 at 20:48

Peter Badida

12.3k10 gold badges53 silver badges99 bronze badges

answered Apr 20, 2015 at 18:54

Sn0opr

1,0262 gold badges12 silver badges38 bronze badges

1 Comment

Devon Bessemer Over a year ago

Seems to have a certificate error on that site. It might be better for you to include more details yourself, especially if that site doesn't exist in the future.

Collectives™ on Stack Overflow

Namespaces and Class loading in php

3 Answers 3

1 Comment

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related