refactor: code style and error handling

.git_hooks/pre-commit

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-docker run --rm -v $(pwd):/code ghcr.io/php-cs-fixer/php-cs-fixer:${FIXER_VERSION:-3-php8.3} fix src
+docker-compose run --rm lint

.php-cs-fixer.php

@@ -0,0 +1,23 @@
+<?php
+
+return (new PhpCsFixer\Config())
+    ->setRules([
+        '@PSR1' => true,
+        '@PSR2' => true,
+        '@PSR12' => true,
+        '@PhpCsFixer' => true,
+        'array_indentation' => true,
+        'trailing_comma_in_multiline' => ['elements' => ['arrays']],
+        'no_whitespace_before_comma_in_array' => true,
+        'whitespace_after_comma_in_array' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'binary_operator_spaces' => [
+            'default' => 'single_space',
+            'operators' => ['=>' => null],
+        ],
+        'multiline_whitespace_before_semicolons' => false,
+    ])
+    ->setFinder(
+        PhpCsFixer\Finder::create()
+            ->in(__DIR__)
+    );

composer.json

@@ -36,17 +36,16 @@
         "ext-mbstring": "*",
         "guzzlehttp/guzzle": "~7.2",
         "ext-zlib": "*",
-        "ext-openssl": "*"
+        "ext-openssl": "*",
+        "vlucas/phpdotenv": "^5.6"
     },
     "require-dev": {
-        "phpunit/phpunit": "8.5.33",
-        "squizlabs/php_codesniffer": "~2.6",
-        "friendsofphp/php-cs-fixer": "~2.19"
+        "phpunit/phpunit": "8.5.33"
     },
     "autoload": {
         "psr-4": { "Fingerprint\\ServerAPI\\" : "./src" }
     },
     "autoload-dev": {
         "psr-4": { "Fingerprint\\ServerAPI\\" : "test/" }
     }
-}
+}