.php-cs-fixer.php

<?php
$finder = PhpCsFixer\Finder::create()
    ->in(__DIR__ . DIRECTORY_SEPARATOR . 'src')
    ->in(__DIR__ . DIRECTORY_SEPARATOR . 'tests')
    ->name(['*.php']);

return (new PhpCsFixer\Config())
    ->setRiskyAllowed(true)
    ->setRules([
        '@PSR1' => true,
        '@PSR2' => true,
        '@PSR12' => true,

        // Override standards defined in PSR rule sets
        'blank_line_after_opening_tag' => false,
        'linebreak_after_opening_tag' => false,

        'array_syntax' => ['syntax' => 'short'],
        'trailing_comma_in_multiline' => ['after_heredoc' => false, 'elements' => ['arrays', 'arguments', 'parameters', 'match']],
        'no_trailing_comma_in_singleline_array' => true,
        'array_indentation' => true,
        'trim_array_spaces' => true,
        'normalize_index_brace' => true,
        'no_spaces_around_offset' => true,
        'no_multiline_whitespace_around_double_arrow' => true,

        'single_quote' => ['strings_containing_single_quote_chars' => true],
        'class_attributes_separation' => true,
        'no_unneeded_curly_braces' => true,
        'no_useless_else' => true,
        'return_assignment' => true,
        'no_unused_imports' => true,
        'lowercase_static_reference' => true,
        'lowercase_cast' => true,
        'native_function_casing' => true,
        'declare_equal_normalize' => [
            'space' => 'none',
        ],
        'include' => true,
        'function_typehint_space' => true,
        'magic_constant_casing' => true,
        'magic_method_casing' => true,
        'no_singleline_whitespace_before_semicolons' => true,
        'no_trailing_comma_in_list_call' => true,
        'no_whitespace_before_comma_in_array' => true,
        'no_whitespace_in_blank_line' => true,
        'short_scalar_cast' => true,
        'standardize_not_equals' => true,
        'modernize_types_casting' => true,
        'combine_nested_dirname' => true,
        'heredoc_indentation' => true,
        'pow_to_exponentiation' => true,
        'ternary_to_null_coalescing' => true,
        'visibility_required' => ['elements' => ['property', 'method', 'const']],

        'phpdoc_align' => ['align' => 'left'],
        'phpdoc_indent' => true,
        'phpdoc_order' => true,
        'phpdoc_trim' => true,
        'phpdoc_types' => true,
        'phpdoc_var_without_name' => true,
        'align_multiline_comment' => ['comment_type' => 'phpdocs_only'],
        'multiline_comment_opening_closing' => true,
        'new_with_braces' => true,
        'no_blank_lines_after_class_opening' => true,
        'no_blank_lines_after_phpdoc' => true,
        'no_empty_comment' => true,
        'no_empty_phpdoc' => true,
        'no_empty_statement' => true,
        'phpdoc_annotation_without_dot' => true,
        'phpdoc_scalar' => true,
        'phpdoc_separation' => true,

        'space_after_semicolon' => true,
        'concat_space' => ['spacing' => 'one'],
        'blank_line_before_statement' => [
            'statements' => [
                'case',
                'continue',
                'declare',
                'return',
                'throw',
                'try',
                'if',
                'for',
                'foreach',
            ],
        ],
        'unary_operator_spaces' => true,
        'method_chaining_indentation' => true,
        'ternary_operator_spaces' => true,
        'cast_spaces' => true,

        'combine_consecutive_issets' => true,
        'combine_consecutive_unsets' => true,

        'implode_call' => true,
        'method_argument_space' => [
            'after_heredoc' => false,
            'keep_multiple_spaces_after_comma' => false,
            'on_multiline' => 'ignore',
        ],
        'no_alias_functions' => true,
        'switch_case_space' => true,
        'single_line_after_imports' => true,
        'single_trait_insert_per_statement' => true,
        'switch_case_semicolon_to_colon' => true,
        'single_class_element_per_statement' => true,
        'ordered_imports' => [
            'sort_algorithm' => 'length',
            'imports_order' => [
                'const',
                'class',
                'function',
            ],
        ],
        'compact_nullable_typehint' => true,
        'return_type_declaration' => ['space_before' => 'none'],
        'single_space_after_construct' => [
            'constructs' => [
                'abstract',
                'as',
                'attribute',
                'break',
                'case',
                'catch',
                'class',
                'clone',
                'comment',
                'const',
                'const_import',
                'continue',
                'do',
                'echo',
                'else',
                'elseif',
                'extends',
                'final',
                'finally',
                'for',
                'foreach',
                'function',
                'function_import',
                'global',
                'goto',
                'if',
                'implements',
                'include',
                'include_once',
                'instanceof',
                'insteadof',
                'interface',
                'match',
                'named_argument',
                'new',
                'open_tag_with_echo',
                'php_doc',
                'php_open',
                'print',
                'private',
                'protected',
                'public',
                'require',
                'require_once',
                'return',
                'static',
                'throw',
                'trait',
                'try',
                'use',
                'use_lambda',
                'use_trait',
                'var',
                'while',
                'yield',
                'yield_from',
            ],
        ],
    ])
    ->setFinder($finder);