--- /dev/null
+<?php
+$header = <<<'EOF'
+This file is part of sebastian/diff.
+
+(c) Sebastian Bergmann <sebastian@phpunit.de>
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+EOF;
+
+return PhpCsFixer\Config::create()
+ ->setRiskyAllowed(true)
+ ->setRules(
+ [
+ 'array_syntax' => ['syntax' => 'long'],
+ 'binary_operator_spaces' => [
+ 'align_double_arrow' => true,
+ 'align_equals' => true
+ ],
+ 'blank_line_after_namespace' => true,
+ 'blank_line_before_return' => true,
+ 'braces' => true,
+ 'cast_spaces' => true,
+ 'concat_space' => ['spacing' => 'one'],
+ 'elseif' => true,
+ 'encoding' => true,
+ 'full_opening_tag' => true,
+ 'function_declaration' => true,
+ 'header_comment' => ['header' => $header, 'separate' => 'none'],
+ 'indentation_type' => true,
+ 'line_ending' => true,
+ 'lowercase_constants' => true,
+ 'lowercase_keywords' => true,
+ 'method_argument_space' => true,
+ 'native_function_invocation' => 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' => true,
+ 'no_leading_namespace_whitespace' => true,
+ 'no_singleline_whitespace_before_semicolons' => true,
+ 'no_spaces_after_function_name' => true,
+ 'no_spaces_inside_parenthesis' => true,
+ 'no_trailing_comma_in_list_call' => true,
+ 'no_trailing_whitespace' => true,
+ 'no_unused_imports' => true,
+ 'no_whitespace_in_blank_line' => true,
+ 'phpdoc_align' => true,
+ 'phpdoc_indent' => true,
+ 'phpdoc_no_access' => true,
+ 'phpdoc_no_empty_return' => true,
+ 'phpdoc_no_package' => true,
+ 'phpdoc_scalar' => true,
+ 'phpdoc_separation' => true,
+ 'phpdoc_to_comment' => true,
+ 'phpdoc_trim' => true,
+ 'phpdoc_types' => true,
+ 'phpdoc_var_without_name' => true,
+ 'self_accessor' => true,
+ 'simplified_null_return' => true,
+ 'single_blank_line_at_eof' => true,
+ 'single_import_per_statement' => true,
+ 'single_line_after_imports' => true,
+ 'single_quote' => true,
+ 'ternary_operator_spaces' => true,
+ 'trim_array_spaces' => true,
+ 'visibility_required' => true,
+ ]
+ )
+ ->setFinder(
+ PhpCsFixer\Finder::create()
+ ->files()
+ ->in(__DIR__ . '/src')
+ ->in(__DIR__ . '/tests')
+ ->name('*.php')
+ );