Composer Autoloading | 易学教程

问题

I'm currently trying to use PSR-0 autoloading with Composer, but I'm getting the following error:

Fatal error: Class 'Twitter\Twitter' not found

My directory structure looks like this

- Project
    - src
        - Twitter
            Twitter.php
    - vendor
    - Test
    index.php

My index.php file looks like this:

<?php

    use Twitter;
    $twitter = new Twitter();

My Twitter.php file looks like this

<?php 

namespace Twitter;

class Twitter
{
    public function __construct()
    {
        // Code Here
    }
}

And finally my composer.json looks like this:

{
"require": {
    "phpunit/phpunit": "3.8.*@dev",
    "guzzle/guzzle": "3.7.*@dev"
},
"minimum-stability": "dev",
"autoload": {
    "psr-0": {
        "Twitter" : "src/Twitter"
    }
}
}

I am getting a little confused. I come from a C# background and this way of working is kinda confusing me. What's the correct way to use PSR-0 autoloading?

回答1:

In your composer.json use:

"autoload": {
    "psr-0": {
        "": "src/"
    }
}

"autoload": {
    "psr-0": {
        "Twitter\\": "src/"
    }
}

and then run php composer.phar dump-autoload

回答2:

Use

"psr-0": {
     "Twitter" : "src/"
 }

This instructs composer to create autoloader, that will look in src for everything from Twitter namespace. And since it is PSR-0, namespace is treated as a folder and added to declared path, so you should not include it in path part in composer.json

回答3:

First of all,

My index.php file looks like this:
use Twitter;
$twitter = new Twitter();

If it's your index.php you forgot to include the composer's autoload script first.

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

See https://getcomposer.org/doc/01-basic-usage.md#autoloading for details.

回答4:

There is an error in your index.php, should be: use Twitter\Twitter; $twitter = new Twitter(); or $twitter = new Twitter\Twitter();

回答5:

This is a very late reply but the first thing you need to make "autoloading" works is have your PHP version be 5.6 and above.

来源：https://stackoverflow.com/questions/20181181/composer-autoloading

标签

php

composer-php

psr-0