php-code-style/README.md

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# Ely.by PHP-CS-Fixer rules
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Set of PHP-CS-Fixer rules used in development of Ely.by PHP projects. It's suited for PHP 7.4 and above.
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[![Latest Version on Packagist][ico-version]][link-packagist]
[![Total Downloads][ico-downloads]][link-downloads]
[![Software License][ico-license]](LICENSE.md)
[![Build Status][ico-build-status]][link-build-status]
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## Installation
First of all install Ely.by PHP-CS-Fixer rules via composer with
[PHP-CS-Fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer):
```sh
composer require --dev friendsofphp/php-cs-fixer ely/php-code-style
```
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Then create a file `.php-cs-fixer.php` with the following contents:
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```php
<?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:
```sh
vendor/bin/php-cs-fixer --diff --dry-run -v fix
```
And then completely fix them all with:
```sh
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:
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```php
<?php
return \Ely\CS\Config::create([
'trailing_comma_in_multiline' => [
'elements' => ['arrays', 'arguments'],
],
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])->setFinder($finder);
```
## Code style
Our code style is based primarily on [PSR-2](https://www.php-fig.org/psr/psr-2/), while borrowing some ideas from
[PSR-12](https://github.com/php-fig/fig-standards/blob/92b198bb/proposed/extended-coding-style-guide.md)
with some changes.
### Example
This example encompasses some of the rules below as a quick overview:
```php
<?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;
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public $field2;
public function sampleFunction(
int $a,
private readonly int $b = null,
): array {
if ($a === $this->b) {
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$result = bar();
} else {
$result = BazClass::bar($this->field1, $this->field2);
}
return $result;
}
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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
<?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
<?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
<?php
if (true) {
// some actions here
}
echo 'the next statement is here';
```
* There MUST be no alignment around multiline function parameters.
```php
<?php
function foo(
string $input,
int $key = 0,
): void {}
```
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[ico-version]: https://img.shields.io/packagist/v/ely/php-code-style.svg?style=flat-square
[ico-license]: https://img.shields.io/badge/license-Apache-green.svg?style=flat-square
[ico-downloads]: https://img.shields.io/packagist/dt/ely/php-code-style.svg?style=flat-square
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[ico-build-status]: https://img.shields.io/github/actions/workflow/status/elyby/php-code-style/ci.yml?branch=master&style=flat-square
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[link-packagist]: https://packagist.org/packages/ely/php-code-style
[link-downloads]: https://packagist.org/packages/ely/php-code-style/stats
[link-build-status]: https://github.com/elyby/php-code-style/actions