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php-coding-standards

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Invoke BEFORE writing PHP code. Provides coding standards and naming conventions.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/php-coding-standards/SKILL.md

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PHP Coding Standards

Using nette/coding-standard

Install globally using the /install-nette-cs command.

After installation, PHP files are automatically checked when edited. Do not run ecs manually.

General Rules

  • Every PHP file must include declare(strict_types=1)
  • Use two empty lines between methods for better readability
  • Document shut-up operator use: @mkdir($dir); // @ - directory may already exist
  • Document weak comparison operators: // == accept null
  • Multiple exceptions can be written in a single exceptions.php file
  • Interface methods don't need visibility as they're always public
  • All properties, return values, and parameters must have types
  • Final constants don't need types as they're self-evident
  • Use single quotes for strings unless containing apostrophes
  • Write all code, comments, variables etc. in English only! (even if you communicate with me in chat in Czech)

Naming Conventions

  • Avoid abbreviations unless full name is too long
  • Use UPPERCASE for two-letter abbreviations, PascalCase/camelCase for longer ones
  • Use nouns or noun phrases for class names
  • Class names should include both specificity and generality (e.g., ArrayIterator)
  • Use PascalCaps for class constants and enums
  • Never use prefixes/suffixes like Abstract, Interface, or I for interfaces/abstract classes
  • PascalCase for classes, camelCase for methods/properties

Formatting

  • Use TABS for indentation (Everywhere! V PHP, JS, HTML, CSS/SCSS, NEON, ...)
  • Prefer to use single quotes (except for HTML)
  • PHP follows Nette Coding Standard (based on PSR-12) with these modifications:
    • No space before parentheses in arrow functions: fn($a) => $b
    • No blank lines required between different use import types
    • Return type and opening brace on separate lines:
public function example(
	string $param,
	array $options,
):
	// method body
}

Global Functions and Constants

  • Write global functions/constants without leading backslash: count($arr) not \count($arr)
  • For compiler-optimizable functions, add use function at the file beginning: 
    use Nette;
use function count, is_array, is_scalar, sprintf;
  • Occasionally import constants that may help the compiler: 
    use const PHP_OS_FAMILY;

Other rules

  • Use try/catch for external operations
  • Prefer modern PHP syntax and concise expressions
    • Example: Use if (is_array($response['data'] ?? null)) instead of if (isset($response['data']) && is_array($response['data']))
  • Uses DOM API with HTML5 parser Lexbor
  • Use named arguments for boolean parameters whose meaning isn't obvious from context (e.g., is_a($obj, $class, allow_string: true)), but not when the method name makes it clear (e.g., setReadonly(true))
  • Place interface/base class outside the namespace containing its implementations (e.g., Foo\Network next to Foo\Networks\*, not inside it)