PHP CS Fixer config for PHP 7.3+ compatible with PSR-12

.php_cs.dist.php

<?php

$rules = [
    '@PSR12' => true,

    // There is a lot of opinionated PSR-12 extending rules below, they all don't break PSR-12.
    // Each risky rule marked by the comment.

    // @array_notation
    'array_syntax' => [
        'syntax' => 'short',
    ],
    'no_multiline_whitespace_around_double_arrow' => true,
    'no_whitespace_before_comma_in_array' => [
        'after_heredoc' => true,
    ],
    'normalize_index_brace' => true,
    'trailing_comma_in_multiline_array' => [
        'after_heredoc' => true,
    ],
    'trim_array_spaces' => true,
    'whitespace_after_comma_in_array' => true,

    // @basic
    'non_printable_character' => [ // risky!
        'use_escape_sequences_in_strings' => true,
    ],

    // @casing
    'magic_constant_casing' => true,
    'magic_method_casing' => true,
    'native_function_casing' => true,
    'native_function_type_declaration_casing' => true,

    // @cast_notation
    'cast_spaces' => [
        'space' => 'single',
    ],
    'no_unset_cast' => true,

    // @class_notation
    'class_attributes_separation' => [
        'elements' => [
            'method' => 'one',
        ],
    ],
    'no_php4_constructor' => true, // risky!

    // @control_structure
    'no_superfluous_elseif' => true,
    'no_useless_else' => true,
    'switch_continue_to_break' => true,

    // @function_notation
    'function_typehint_space' => true,
    'lambda_not_used_import' => true,
    'nullable_type_declaration_for_default_null_value' => true,
    // 'phpdoc_to_param_type' => true, // risky! experimental!
    'phpdoc_to_return_type' => true, // risky! experimental!
    'void_return' => true, // risky!

    // @import
    'fully_qualified_strict_types' => true,
    'global_namespace_import' => true,
    'no_unused_imports' => true,
    'ordered_imports' => [
        'imports_order' => [
            'class',
            'function',
            'const',
        ],
        'sort_algorithm' => 'alpha', // override of PSR-12 default
    ],

    // @language_construct
    'single_space_after_construct' => true,

    // @namespace_notation
    'clean_namespace' => true,
    'no_leading_namespace_whitespace' => true,

    // @operator
    'binary_operator_spaces' => true,
    'concat_space' => [
        'spacing' => 'one',
    ],
    'object_operator_without_whitespace' => true,
    'operator_linebreak' => [
        'only_booleans' => true,
    ],
    'ternary_to_elvis_operator' => true, // risky!
    'ternary_to_null_coalescing' => true,
    'unary_operator_spaces' => true,

    // @php_unit
    'php_unit_method_casing' => [
        'case' => 'snake_case',
    ],
    'php_unit_namespaced' => true, // risky!
    'php_unit_test_annotation' => true, // risky!

    // @phpdoc
    'align_multiline_comment' => [
        'comment_type' => 'phpdocs_like',
    ],
    'no_empty_phpdoc' => true,
    'no_superfluous_phpdoc_tags' => [
        'allow_mixed' => true,
        'remove_inheritdoc' => true,
    ],
    'phpdoc_indent' => true,
    'phpdoc_line_span' => [
        'const' => 'single',
        'property' => 'single',
    ],
    'phpdoc_no_access' => true,
    'phpdoc_no_alias_tag' => true,
    'phpdoc_no_useless_inheritdoc' => true,
    'phpdoc_scalar' => true,
    'phpdoc_single_line_var_spacing' => true,
    'phpdoc_trim' => true,
    'phpdoc_trim_consecutive_blank_line_separation' => true,
    'phpdoc_types' => true,
    'phpdoc_types_order' => [
        'sort_algorithm' => 'none',
        'null_adjustment' => 'always_last',
    ],
    'phpdoc_var_annotation_correct_order' => true,
    'phpdoc_var_without_name' => true,

    // @semicolon
    'no_empty_statement' => true,
    'no_singleline_whitespace_before_semicolons' => true,
    'space_after_semicolon' => true,

    // @strict
    'strict_param' => true, // risky!

    // @string_notation
    'single_quote' => true,
    'string_line_ending' => true, // risky!

    // @whitespace
    'array_indentation' => true,
    'heredoc_indentation' => true,
    'method_chaining_indentation' => true,
    'no_extra_blank_lines' => [
        'tokens' => [
            'break',
            'case',
            'continue',
            'curly_brace_block',
            'default',
            'extra',
            'parenthesis_brace_block',
            'return',
            'square_brace_block',
            'switch',
            'throw',
            'use',
            'use_trait',
        ],
    ],
    'no_spaces_around_offset' => true,
];

$finder = PhpCsFixer\Finder::create()
    ->in(__DIR__)
    ->exclude('node_modules');

$config = new PhpCsFixer\Config();
return $config
    ->setFinder($finder)
    ->setRules($rules)
    ->setRiskyAllowed(true);

For version https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/2.18