.php-cs-fixer.php

<?php
$finder = PhpCsFixer\Finder::create()
    ->in(__DIR__ . '/src')
    ->in(__DIR__ . '/tests');

return (new PhpCsFixer\Config())
    ->setRules([
        '@PSR2'                                 => true,
        'array_syntax'                          => ['syntax' => 'short'],
        'concat_space'                          => ['spacing' => 'one'],
        'new_with_braces'                       => true,
        'no_blank_lines_after_phpdoc'           => true,
        'no_empty_phpdoc'                       => true,
        'no_empty_comment'                      => true,
        'no_leading_import_slash'               => true,
        'no_trailing_comma_in_singleline_array' => true,
        'no_unused_imports'                     => true,
        'ordered_imports'                       => ['imports_order' => null, 'sort_algorithm' => 'alpha'],
        'phpdoc_add_missing_param_annotation'   => ['only_untyped' => true],
        'phpdoc_align'                          => true,
        'phpdoc_no_empty_return'                => true,
        'phpdoc_order'                          => true,
        'phpdoc_scalar'                         => true,
        'phpdoc_to_comment'                     => true,
        'psr_autoloading'                       => true,
        'return_type_declaration'               => ['space_before' => 'none'],
        'single_blank_line_before_namespace'    => true,
        'single_quote'                          => true,
        'space_after_semicolon'                 => true,
        'ternary_operator_spaces'               => true,
        'trailing_comma_in_multiline'           => true,
        'trim_array_spaces'                     => true,
        'whitespace_after_comma_in_array'       => true,
    ])
    ->setFinder($finder);