Composerでpsr-4のオートローダーを生成する際のディレクトリ指定

やりたいこと

Laravel付属の「composer.json」にPSR-4形式のオートローダーを追加したかったので、
「”名前空間prefix”: “ディレクトリ”」と記述する際の「ディレクトリ」部分を変えてみるとどうなるか試した。

環境

さくらのレンタルサーバスタンダード
PHP 5.4.29
Laravel 4.2.8

$ php --version
PHP 5.4.29 (cli) (built: Jun 11 2014 18:20:32)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

$ php artisan --version
Laravel Framework version 4.2.8

$ composer --version
Composer version a8adbfeb9fc7861deade782938222714168a22a8 2014-09-05 16:28:50

$ php --version

PHP 5.4.29 (cli) (built: Jun 11 2014 18:20:32)

$ php artisan --version

Laravel Framework version 4.2.8

$ composer --version

Composer version a8adbfeb9fc7861deade782938222714168a22a8 2014-09-05 16:28:50

やったこと

Laravelのルートディレクトリを「/LARAVEL-ROOT/」とする。
「/LARAVEL-ROOT/composer.json」の「autoloader psr-4」部分を変更し、「composer dump-autoload」を実行すると「/vendor/composer/autoload_psr4.php」が生成される。

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "repositories": [
        {
            "type": "pear",
            "url": "http://pear.php.net/"
        }
    ],
    "require": {
        "laravel/framework": "4.2.*",
        "maatwebsite/excel": "1.*",
        "pear-pear.php.net/Mail_mimeDecode" : "*"
    },
    "autoload": {
        "classmap": [
            "app/commands",
            "app/controllers",
            "app/models",
            "app/database/migrations",
            "app/database/seeds",
            "app/tests/TestCase.php"
        ],
        "psr-4": {
            "ZZZ\\": "app/zzz",
            "YYY\\": "vendor/yyy",
            "XXX\\": "xxx",
            "WWW\\": "/www"
        }
    },
    "scripts": {
        "post-install-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ]
    },
    "config": {
        "preferred-install": "dist"
    },
    "minimum-stability": "stable"
}

{

"name": "laravel/laravel",

"description": "The Laravel Framework.",

"keywords": ["framework", "laravel"],

"license": "MIT",

"type": "project",

"repositories": [

{

"type": "pear",

"url": "http://pear.php.net/"

}

"require": {

"laravel/framework": "4.2.*",

"maatwebsite/excel": "1.*",

"pear-pear.php.net/Mail_mimeDecode" : "*"

"autoload": {

"classmap": [

"app/commands",

"app/controllers",

"app/models",

"app/database/migrations",

"app/database/seeds",

"app/tests/TestCase.php"

"psr-4": {

"ZZZ\\": "app/zzz",

"YYY\\": "vendor/yyy",

"XXX\\": "xxx",

"WWW\\": "/www"

}

"scripts": {

"post-install-cmd": [

"php artisan clear-compiled",

"php artisan optimize"

"post-update-cmd": [

"php artisan clear-compiled",

"php artisan optimize"

"post-create-project-cmd": [

"php artisan key:generate"

]

"config": {

"preferred-install": "dist"

"minimum-stability": "stable"

}

結果

<?php

// autoload_psr4.php @generated by Composer

$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);

return array(
    'ZZZ\\' => array($baseDir   . '/app/zzz'),
    'YYY\\' => array($vendorDir . '/yyy'),
    'XXX\\' => array($baseDir   . '/xxx'),
    'WWW\\' => array('/www'),
    'Monolog\\' => array($vendorDir . '/monolog/monolog/src/Monolog'),
);

<?php

// autoload_psr4.php @generated by Composer

$vendorDir = dirname(dirname(__FILE__));

$baseDir = dirname($vendorDir);

return array(

'ZZZ\\' => array($baseDir . '/app/zzz'),

'YYY\\' => array($vendorDir . '/yyy'),

'XXX\\' => array($baseDir . '/xxx'),

'WWW\\' => array('/www'),

'Monolog\\' => array($vendorDir . '/monolog/monolog/src/Monolog'),

);

「vendor」で始めると「$vendorDir」を付けてくれる。
「app」とかその他（xxx）で始めると「$baseDir」を付けてくれる。
「/」で始めるとそのまんま絶対パスになる。