Esse é um exemplo de configuração do php-cs-fixer que foi construído usando a predefinição Laravel do StyleCI.

.php_cs.dist

<?php

$header = <<<'EOF'
Esse arquivo faz parte de <Empresa/Projeto>

(c) Nome Autor <e-mail>

Lorem ipsum ...
EOF;

return PhpCsFixer\Config::create()
    ->setRiskyAllowed(true)
    ->setRules([
          'array_syntax' => 
          [
            'syntax' => 'short',
          ],
          'binary_operator_spaces' => 
          [
            'align_equals' => false,
            'align_double_arrow' => NULL,
          ],
          'blank_line_after_namespace' => true,
          'blank_line_after_opening_tag' => true,
          'blank_line_before_return' => true,
          'braces' => true,
          'cast_spaces' => true,
          'class_definition' => true,
          'concat_space' => 
          [
            'spacing' => 'none',
          ],
          'declare_equal_normalize' => true,
          'elseif' => true,
          'encoding' => true,
          'full_opening_tag' => true,
          'function_declaration' => true,
          'function_typehint_space' => true,
          'general_phpdoc_annotation_remove' => 
          [
            0 => 'access',
            1 => 'package',
            2 => 'subpackage',
          ],
          'hash_to_slash_comment' => true,
          'heredoc_to_nowdoc' => true,
          'include' => true,
          'indentation_type' => true,
          'line_ending' => true,
          'lowercase_cast' => true,
          'lowercase_constants' => true,
          'lowercase_keywords' => true,
          'method_argument_space' => true,
          'method_separation' => true,
          'native_function_casing' => true,
          'no_alias_functions' => true,
          'no_blank_lines_after_class_opening' => true,
          'no_blank_lines_after_phpdoc' => true,
          'no_closing_tag' => true,
          'no_empty_phpdoc' => true,
          'no_empty_statement' => true,
          'no_extra_consecutive_blank_lines' => 
          [
            0 => 'throw',
            1 => 'use',
            2 => 'useTrait',
            3 => 'extra',
          ],
          'no_leading_import_slash' => true,
          'no_leading_namespace_whitespace' => true,
          'no_mixed_echo_print' => 
          [
            'use' => 'echo',
          ],
          'no_multiline_whitespace_around_double_arrow' => true,
          'no_multiline_whitespace_before_semicolons' => true,
          'no_short_bool_cast' => true,
          'no_singleline_whitespace_before_semicolons' => true,
          'no_spaces_after_function_name' => true,
          'no_spaces_around_offset' => 
          [
            0 => 'inside',
          ],
          'no_spaces_inside_parenthesis' => true,
          'no_trailing_comma_in_list_call' => true,
          'no_trailing_comma_in_singleline_array' => true,
          'no_trailing_whitespace' => true,
          'no_trailing_whitespace_in_comment' => true,
          'no_unneeded_control_parentheses' => true,
          'no_unreachable_default_argument_value' => true,
          'no_unused_imports' => true,
          'no_useless_return' => true,
          'no_whitespace_before_comma_in_array' => true,
          'no_whitespace_in_blank_line' => true,
          'normalize_index_brace' => true,
          'not_operator_with_successor_space' => true,
          'object_operator_without_whitespace' => true,
          'ordered_imports' => 
          [
            'sortAlgorithm' => 'length',
          ],
          'phpdoc_indent' => true,
          'phpdoc_inline_tag' => true,
          'phpdoc_no_alias_tag' => 
          [
            'type' => 'var',
          ],
          'phpdoc_no_useless_inheritdoc' => true,
          'phpdoc_scalar' => true,
          'phpdoc_single_line_var_spacing' => true,
          'phpdoc_summary' => true,
          'phpdoc_to_comment' => true,
          'phpdoc_trim' => true,
          'phpdoc_types' => true,
          'phpdoc_var_without_name' => true,
          'psr4' => true,
          'self_accessor' => true,
          'short_scalar_cast' => true,
          'simplified_null_return' => true,
          'single_blank_line_at_eof' => true,
          'single_blank_line_before_namespace' => true,
          'single_class_element_per_statement' => true,
          'single_import_per_statement' => true,
          'single_line_after_imports' => true,
          'single_quote' => true,
          'space_after_semicolon' => true,
          'standardize_not_equals' => true,
          'switch_case_semicolon_to_colon' => true,
          'switch_case_space' => true,
          'ternary_operator_spaces' => true,
          'trailing_comma_in_multiline_array' => true,
          'trim_array_spaces' => true,
          'unary_operator_spaces' => true,
          'visibility_required' => 
          [
            0 => 'method',
            1 => 'property',
          ],
          'whitespace_after_comma_in_array' => true,
          'header_comment' => 
          [
            'header' => $header
          ],
    ])
    ->setFinder(
        PhpCsFixer\Finder::create()
            ->exclude([
              'vendor',
              'node_modules',
              'bootstrap',
              'storage/framework',
            ])
            ->notName('*.md')
            ->notName('*.xml')
            ->notName('*.yml')
            ->notName('*.lock')
    );