使用psr-4自动加载文件时出现问题

Question

I've been trying to get psr-4 autoloading work for over a week now with no success.

My file structure is as follows:

-Project
  -src
    -classes
       session.php
  -vendor
  index.php

I've created the psr-4 autoload function as follows:

 "autoload": {
        "psr-4": {
         "classes\\": "src/classes"
    }

}

after using composer dump-autoload -0 ,inside my session.php class I gave the namespace:

namespace classes;

class session{

public static function exist($name){

    return(isset($_SESSION[$name])) ? true : false;
}

I then required the autoloader and used the use function to name the session class as follows:

use src\classes\session as session;

require_once('vendor/autoload.php');

session::put('test', 'test');

after opening up the index.php page, I get a

Fatal error: Class 'src\classes\session' not found in /var/www/test/Project/index.php on line 10

is my directory structure / php correct? I've tried many different guides online and can't seem to get it to work.

Answer 1

Most simple solution:

use classes\session;

require_once('vendor/autoload.php');

session::put('test', 'test');

Unrelated

However, you probably don't want to use classes as a vendor namespace, but instead adjust a few things here and there:

Directory structure

-Project
  -src
    Session.php
  -public
    index.php
  -vendor

Autoloading configuration in composer.json

{
    "autoload": {
        "psr-4": {
            "Juakali\\": "src"
        }
    }
}

Replace Juakali with a vendor namespace you prefer, this is just a suggestion. Ideally, if you intend to publish your package, it should be one that isn't already claimed by someone else, see https://packagist.org.

For reference, see

• http://www.php-fig.org/psr/psr-4
• https://getcomposer.org/doc/04-schema.md#psr-4

Juakali\Session

Use the aforementioned vendor namespace of your choice:

namespace Juakali;

class Session
{
    public static function exist($name)
    {
        return isset($_SESSION[$name]);
    }
}

Consider using a widely used coding style, for example PSR-2.

For reference, see

• http://www.php-fig.org/psr/psr-2/

index.php

Assuming that you want to expose index.php as the entry point for a web application, move it into a directory which you feel confident to expose as a document root of your web server, adjust the import in index.php, as well as the path to vendor/autoload.php:

use Juakali\Session;

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

Session::put('test', 'test');