php-code-style/README.md

Ely.by PHP-CS-Fixer rules

Set of PHP-CS-Fixer rules used in development of Ely.by PHP projects. It's suited for PHP 7.4 and above.

Installation

First of all install Ely.by PHP-CS-Fixer rules via composer with PHP-CS-Fixer:

composer require --dev friendsofphp/php-cs-fixer ely/php-code-style

Then create a file .php-cs-fixer.php with the following contents:

<?php
$finder = \PhpCsFixer\Finder::create()
    ->in(__DIR__);

return \Ely\CS\Config::create()
    ->setFinder($finder);

And that's it. You can now find code style violations with following command:

vendor/bin/php-cs-fixer --diff --dry-run -v fix 

And then completely fix them all with:

vendor/bin/php-cs-fixer fix

Configuration

You can pass a custom set of rules to the \Ely\CS\Config::create() call. For example, it can be used to validate a project with PHP 7.4 compatibility:

<?php
return \Ely\CS\Config::create([
    'trailing_comma_in_multiline' => [
        'elements' => ['arrays', 'arguments'],
    ],
])->setFinder($finder);

Code style

Our code style is based primarily on PSR-2, while borrowing some ideas from PSR-12 with some changes.

Example

This example encompasses some of the rules below as a quick overview:

<?php
declare(strict_types=1);

namespace Vendor\Package;

use Vendor\Package\SomeNamespace\ClassA;

class Foo extends Bar implements FooInterface {
    use SomeTrait;

    private const SAMPLE_1 = 123;
    private const SAMPLE_2 = 321;

    public Typed $field1;

    public $field2;

    public function sampleFunction(
        int $a,
        private readonly int $b = null,
    ): array {
        if ($a === $this->b) {
            $result = bar();
        } else {
            $result = BazClass::bar($this->field1, $this->field2);
        }

        return $result;
    }

    public function setToNull(): self {
        $this->field1 = null;
        return $this;
    }

}

Key differences:

• Opening braces for classes MUST be on the same line.

• Opening braces for methods MUST be on the next line.

Additional rules:

• There MUST be one empty line before return statement, except when there is only one statement before it.

  <?php
  
  function a() {
      $a = '123';
      return $a . ' is a number';
  }
  
  function b() {
      $a = '123';
      $b = 'is';
  
      return $a . ' ' . $b . ' a number';
  }
  

• There MUST be one blank line around class body, but there MUST be no blank lines around anonymous class body.

  <?php
  class Test {
  
      public function method() {
          $obj = new class extends Foo {
              public function overriddenMethod() {
                  // code body
              }
          };
      }
  
  }
  

• Visibility MUST be declared for all methods, properties and constants.

• There MUST be one blank line after an each of if, switch, for, foreach, while and do-while bodies.

  <?php
  if (true) {
      // some actions here
  }
  
  echo 'the next statement is here';
  

• There MUST be no alignment around multiline function parameters.

  <?php
  function foo(
      string $input,
      int $key = 0,
  ): void {}