Add PHP CS Fixer for consistent code style

.gitignore

@@ -13,3 +13,6 @@ var/
 # PHPUnit caches:
 .phpunit.cache/
 .phpunit.result.cache
+
+# PHP CS Fixer caches:
+.php-cs-fixer.cache

.php-cs-fixer.dist.php

@@ -0,0 +1,34 @@
+<?php
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+$finder = Finder::create()
+	->in(__DIR__ . '/src')
+	->in(__DIR__ . '/tests')
+	->in(__DIR__ . '/public')
+	->in(__DIR__ . '/config')
+	->exclude('vendor')
+	->name('*.php')
+	->ignoreDotFiles(true)
+	->ignoreVCS(true);
+
+return (new Config())
+	->setIndent("\t")
+	->setRiskyAllowed(true)
+	->setRules([
+		'@PSR12' => true,
+		'array_syntax' => ['syntax' => 'short'],
+		'blank_line_before_statement' => ['statements' => ['return', 'throw', 'break', 'continue', 'exit']],
+		'braces_position' => ['control_structures_opening_brace' => 'next_line_unless_newline_at_signature_end'],
+		'control_structure_continuation_position' => ['position' => 'next_line'],
+		'indentation_type' => true,
+		'no_extra_blank_lines' => true,
+		'no_trailing_whitespace' => true,
+		'no_unused_imports' => true,
+		'ordered_imports' => true,
+		'single_blank_line_at_eof' => true,
+		'single_import_per_statement' => true,
+		'trailing_comma_in_multiline' => ['elements' => ['arrays', 'arguments']],
+	])
+	->setFinder($finder);

composer.json

@@ -13,6 +13,7 @@
 		}
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^12.5"
+		"phpunit/phpunit": "^12.5",
+		"friendsofphp/php-cs-fixer": "^3.94"
 	}
 }