### Install CodeIgniter Coding Standard

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Install the library as a development dependency using Composer. This is the recommended approach for most projects.

```bash
composer require --dev codeigniter/coding-standard
```

```bash
composer require codeigniter/coding-standard
```

--------------------------------

### Minimal Project Setup with Factory::create()

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Configure PHP CS Fixer for application projects using the CodeIgniter4 ruleset without license headers. This is the simplest setup for automated style enforcement.

```php
<?php

// .php-cs-fixer.dist.php — minimal setup for any PHP project
use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

return Factory::create(new CodeIgniter4())->forProjects();

```

```bash
# Run the fixer in dry-run mode to preview changes
vendor/bin/php-cs-fixer fix --dry-run --verbose --diff

# Apply fixes
vendor/bin/php-cs-fixer fix --verbose

```

--------------------------------

### Setup PHP CS Fixer Configuration

Source: https://github.com/codeigniter/coding-standard/blob/1.x/README.md

Create a .php-cs-fixer.dist.php file at the root of your project to configure the CodeIgniter Coding Standard.

```php
<?php

use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

return Factory::create(new CodeIgniter4())->forProjects();

```

--------------------------------

### Library Setup with License Header

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Configure PHP CS Fixer for libraries, including a license header in each fixed PHP file. Specify the library name, author, and optional contact email and copyright year.

```php
<?php

// .php-cs-fixer.dist.php — library setup with license header
use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

return Factory::create(new CodeIgniter4())->forLibrary(
    'My Library Name',        // library name
    'My Organization',        // author / organization
    'contact@example.com',    // email (optional)
    2021,                     // starting copyright year (optional)
);

// Expected header injected at the top of every PHP file:
//
// /**
//  * This file is part of My Library Name.
//  *
//  * (c) 2021 My Organization <contact@example.com>
//  *
//  * For the full copyright and license information, please view
//  * the LICENSE file that was distributed with this source code.
//  */

```

--------------------------------

### Add License Headers to PHP Files

Source: https://github.com/codeigniter/coding-standard/blob/1.x/README.md

Configure the coding standard to automatically add license headers to your PHP files. Provide library name, author name, email, and starting year.

```php
<?php

use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

return Factory::create(new CodeIgniter4())->forLibrary(
    'CodeIgniter 4 framework',
    'CodeIgniter Foundation',
    'admin@codeigniter.com',
    2021,
);

```

--------------------------------

### Configure Overriding Rules and Options

Source: https://github.com/codeigniter/coding-standard/blob/1.x/README.md

Modify the PhpCsFixer\Config instance by providing overriding rules or options. This example disables caching.

```php
<?php

use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

return Factory::create(new CodeIgniter4(), [], [
    'usingCache' => false,
])->forProjects();

```

--------------------------------

### Configure PHP CS Fixer with Factory::create()

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Use this snippet to configure PHP CS Fixer with custom Finder and options. It allows overriding default rules and specifying cache settings.

```php
<?php

// .php-cs-fixer.dist.php — full configuration with custom Finder and options
use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;
use PhpCsFixer\Finder;

// Scope the fixer to specific directories and exclude build artefacts
$finder = Finder::create()
    ->files()
    ->in([__DIR__ . '/src', __DIR__ . '/tests'])
    ->exclude(['build', 'vendor'])
    ->append([__FILE__]); // also fix this config file itself

$overrides = [
    'declare_strict_types' => true,
];

$options = [
    'finder'      => $finder,
    'cacheFile'   => 'build/.php-cs-fixer.cache',
    'usingCache'  => true,   // default: true
];

return Factory::create(new CodeIgniter4(), $overrides, $options)->forLibrary(
    'CodeIgniter 4 framework',
    'CodeIgniter Foundation',
    'admin@codeigniter.com',
    2021,
);
```

--------------------------------

### Run PHPUnit Test Suite

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Command to execute the PHPUnit test suite for the CodeIgniter Coding Standard.

```bash
# Run the test suite
vendor/bin/phpunit --testdox

# Expected output (abridged):
# CodeIgniter4 (CodeIgniter\CodingStandard\Tests\CodeIgniter4)
#  ✔ Rules are sorted alphabetically
#  ✔ All configured rules exist in the installed php-cs-fixer version
#  ✔ Deprecated rules are not used
```

--------------------------------

### Overriding Rules with Factory::create()

Source: https://context7.com/codeigniter/coding-standard/llms.txt

Customize the CodeIgniter4 ruleset by providing an array of overrides to `Factory::create()`. This allows modification or disabling of specific rules without forking the ruleset class.

```php
<?php

// .php-cs-fixer.dist.php — override selected rules
use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Factory;

$overrides = [
    // Enable strict types declaration (disabled by default in the ruleset)
    'declare_strict_types' => true,

    // Disable the rule that rewrites rand() to mt_rand()
    'random_api_migration' => false,

    // Change binary operator alignment to simple single-space
    'binary_operator_spaces' => ['default' => 'single_space'],
];

return Factory::create(new CodeIgniter4(), $overrides)->forProjects();

```

--------------------------------

### Inspect CodeIgniter4 Ruleset

Source: https://context7.com/codeigniter/coding-standard/llms.txt

This snippet demonstrates how to programmatically inspect the ruleset provided by the CodeIgniter4 class. It retrieves the ruleset name, the full array of fixer rules, the required PHP version, and the status of risky rules.

```php
<?php

use CodeIgniter\CodingStandard\CodeIgniter4;

$ruleset = new CodeIgniter4();

// Retrieve human-readable ruleset name
echo $ruleset->getName();
// => "CodeIgniter4 Coding Standards"

// Get the full array of fixer rules (key => true|false|array)
$rules = $ruleset->getRules();
var_dump(isset($rules['array_syntax']));       // bool(true)
var_dump($rules['array_syntax']);              // array(1) { ["syntax"] => string(5) "short" }
var_dump($rules['declare_strict_types']);      // bool(false)  — disabled by default

// Minimum PHP version required (integer, e.g. 80100 = PHP 8.1.0)
echo $ruleset->getRequiredPHPVersion();
// => 80100

// Whether risky fixers are automatically allowed
var_dump($ruleset->willAutoActivateIsRiskyAllowed());
// => bool(true)
```

--------------------------------

### PHPUnit Test for CodeIgniter4 Ruleset

Source: https://context7.com/codeigniter/coding-standard/llms.txt

This PHPUnit test class validates the CodeIgniter4 ruleset. It extends AbstractRulesetTestCase and automatically resolves the ruleset class to be tested.

```php
<?php

declare(strict_types=1);

namespace CodeIgniter\CodingStandard\Tests;

use CodeIgniter\CodingStandard\CodeIgniter4;
use Nexus\CsConfig\Ruleset\RulesetInterface;
use Nexus\CsConfig\Test\AbstractRulesetTestCase;
use PHPUnit\Framework\Attributes\CoversClass;

/**
 * @internal
 */
#[CoversClass(CodeIgniter4::class)]
final class CodeIgniter4Test extends AbstractRulesetTestCase
{
    protected static function createRuleset(): RulesetInterface
    {
        // Resolves the tested class from the test class name automatically.
        // For "CodeIgniter4Test" → instantiates "CodeIgniter4".
        /** @var class-string<RulesetInterface> $ruleset */
        $ruleset = preg_replace(
            '/^(CodeIgniter\\CodingStandard)\\Tests(\\\\S+)Test/',
            '$1$2',
            self::class,
        );

        return new $ruleset();
    }
}
```

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