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Composerでautoload.phpを作成する

Composerでオートローダを作成する方法

ディレクトリ構成

composer.json
src/
  index.php
  bar/
    Hoge.php   ... foo\bar\Hoge クラス
composer.json
{
    "autoload": {
        "psr-4": {
            "foo\\": "src"
        }
    }
}

*composer.jsonの記述は場合によってことなります。
https://qiita.com/suin/items/b31e3c5bff15c821ccaa

コマンドラインでcomposer.jsonが置いてあるディレクトリに移動し
コマンドを実行

composer dump-autoload

vendorが生成される

composer.json
vendor/
  composer/
  autoload.php
src/
  index.php
  bar/
    Hoge.php   ... foo\bar\Hoge クラス

autoload.phpを読み込む

index.php
<?php
use foo\bar\Hoge;

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

参考文献

Composerのautoloadの書き方早見表

PHP開発でComposerを使わないなんてありえない!基礎編

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