HTTPクライアントGuzzleをセットアップと簡易動作確認

> composer require guzzlehttp/guzzle *

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./composer.json has been created
Running composer update guzzlehttp/guzzle
Loading composer repositories with package information
Updating dependencies
Lock file operations: 8 installs, 0 updates, 0 removals
  - Locking guzzlehttp/guzzle (7.7.0)
  - Locking guzzlehttp/promises (2.0.0)
  - Locking guzzlehttp/psr7 (2.5.0)
  - Locking psr/http-client (1.0.2)
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  - Locking ralouphie/getallheaders (3.0.3)
  - Locking symfony/deprecation-contracts (v3.2.1)
Writing lock file
Installing dependencies from lock file (including require-dev)
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  - Syncing guzzlehttp/guzzle (7.7.0) into cache
  - Installing symfony/deprecation-contracts (v3.2.1): Cloning e2d1534420 from cache
  - Installing psr/http-message (2.0): Cloning 402d35bcb9 from cache
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  - Installing guzzlehttp/psr7 (2.5.0): Cloning b635f279ed from cache
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  - Installing guzzlehttp/guzzle (7.7.0): Cloning fb7566cacc from cache
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Generating autoload files
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{
    "require": {
        "guzzlehttp/guzzle": "*"
    }
}

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

// クライアントを生成
$cli = new GuzzleHttp\Client([
    'base_uri' => 'https://wings.msn.to/'
]);

// リクエストを送信
$res = $cli -> request('get', '/tmp/sample.txt');

// 取得したコンテンツを出力
print ("<b>getBody()メソッドからの表示<br></b>");
print ($res -> getBody() . '<br><br>');

// jsonファイルの内容をrequestメソッドを利用して出力
$res = $cli -> request('get', '/tmp/books.json');
$obj = json_decode($res -> getBody());
print ("<b>request()メソッドからの表示<br></b>");
print_r ($obj);
print ('<br><br>');

// jsonファイルの内容をgetメソッドを利用して出力
$res = $cli -> get('/tmp/books.json');
$obj = json_decode($res -> getBody());
print ("<b>get()メソッドからの表示<br></b>");
print_r($obj);
print ('<br><br>');

// jsonファイルの内容を格納した変数のvar_dump
print ("<b>var_dump()メソッドからの表示<br></b>");
var_dump($obj);
print('<br><br>');

// jsonファイル内の特定の要素を取得
print ('<b>$obj -> books[0] -> title<br></b>');
print ($obj -> books[0] -> {'title'});
print ('<br><br>');

// POSTを行い、結果を表示する。
$res = $cli -> post('/tmp/post.php', [
    'form_params' => [
        'name' => 'テストネーム'
    ]
]);
print ('<b>POSTでnameにテストネームを送信し、結果を表示する<br></b>');
print ($res -> getBody());