Composer Autoloading classes not found

问题

I have folder structure like:

includes/
  libraries/
    Classes/
      Contact/
        Contact.php
        ContactController.php

admin/
  controllers/
    contact/
      edit.php

Contact.php is my class that file that I'm trying to use. The file contains.

<?php
namespace Classes;

class Contact {
    function __construct() {
        die('here');
    }
}

I have my composer.json file like:

{
    "autoload": {
        "psr-4": {
            "Classes\\": "includes/libraries/Classes/"
        }
    },
}

The file I'm trying to use the Contact class in is edit.php within the admin/controllers/contact/ folder. My edit.php file is like:

<?php

use Classes\Contact;

$contact = new Contact();

var_dump($contact);

This file has the vendor/autoload.php file included, yet I can't seem to get it to use the class?

回答1:

Classes/Contact/Contact.php and the composer rule "Classes\\": "includes/libraries/Classes/" imply Classes\Contact\Contact class, not Classes\Contact.

So if you actually want Classes\Contact class, move the Classes/Contact/Contact.php file up to the parent directory: Classes/Contact.php.

If, however, the desired namespace path to the class is Classes\Contact\Contact, then change the use:

use Classes\Contact\Contact;

And the namespace:

namespace Classes\Contact;

class Contact {}

Example

├── composer.json
├── includes
│   └── libraries
│       └── Classes
│           └── Contact
│               └── Contact.php
├── test.php
└── vendor
    ├── autoload.php
    └── composer
        ├── autoload_classmap.php
        ├── autoload_namespaces.php
        ├── autoload_psr4.php
        ├── autoload_real.php
        ├── autoload_static.php
        ├── ClassLoader.php
        ├── installed.json
        └── LICENSE

The files under vendor/ are generated by composer.

composer.json

{
    "name": "testpsr4",
    "autoload": {
        "psr-4": {
            "Classes\\": "includes/libraries/Classes"
        }
    }
}

test.php

<?php
require_once __DIR__ . '/vendor/autoload.php';

use Classes\Contact\Contact;

$c = new Contact;
$c->test();

includes/libraries/Classes/Contact/Contact.php

<?php
namespace Classes\Contact;

class Contact {
    public function test () {
        echo __METHOD__, PHP_EOL;
    }
}

Testing

composer update
php test.php

Output

Classes\Contact\Contact::test

来源：https://stackoverflow.com/questions/40126706/composer-autoloading-classes-not-found

标签

php

namespaces

composer-php

autoload