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WordPress Coding Standards for PHP_CodeSniffer

This project is a collection of PHP_CodeSniffer rules (sniffs) to validate code developed for WordPress. It ensures code quality and adherence to coding conventions, especially the official WordPress Coding Standards.

Project history

  • In April 2009 original project from Urban Giraffe was published.
  • In May 2011 the project was forked on GitHub by Chris Adams.
  • In April 2012 XWP started to dedicate resources to the development and currently maintains the project.

Installation

Composer

Standards can be installed with Composer dependency manager:

composer create-project wp-coding-standards/wpcs:dev-master --no-dev

Running this command will:

  1. Install WordPress standards into wpcs directory.
  2. Install PHP_CodeSniffer.
  3. Register WordPress standards in PHP_CodeSniffer configuration.
  4. Make phpcs command available from wpcs/vendor/bin.

For convenience of using phpcs as global command you might want to add path to wpcs/vendor/bin directory to a PATH environment of your operating system.

Standalone

  1. Install PHP_CodeSniffer by following its installation instructions (via Composer, PEAR, or Git checkout).

Do ensure, if for example you're using VVV, that you have the latest version of CodeSniffer (earlier versions, e.g. ~1.5.5, may warn about incorrect line indentation on every single line even if your code is actually correct.)

  1. Clone WordPress standards repository:

     git clone -b master https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards.git wpcs

  2. Add its path to PHP_CodeSniffer configuration:

     phpcs --config-set installed_paths /path/to/wpcs

How to use

Command line

Run the phpcs command line tool on a given file or directory, for example:

phpcs --standard=WordPress wp-load.php

Will result in following output:

--------------------------------------------------------------------------------
FOUND 13 ERROR(S) AFFECTING 7 LINE(S)
--------------------------------------------------------------------------------
  1 | ERROR | End of line character is invalid; expected "\n" but found "\r\n"
 22 | ERROR | No space after opening parenthesis of function  prohibited
 22 | ERROR | No space before closing parenthesis of function  prohibited
 26 | ERROR | No space before closing parenthesis of function  prohibited
 31 | ERROR | No space after opening parenthesis of function  prohibited
 31 | ERROR | No space before closing parenthesis of function  prohibited
 31 | ERROR | No space after opening parenthesis of function  prohibited
 31 | ERROR | No space before closing parenthesis of function  prohibited
 34 | ERROR | No space after opening parenthesis of function  prohibited
 34 | ERROR | No space before closing parenthesis of function  prohibited
 55 | ERROR | Detected usage of a non-validated input variable: $_SERVER
 55 | ERROR | Detected usage of a non-sanitized input variable: $_SERVER
 70 | ERROR | String "Create a Configuration File" does not require double
	|       | quotes; use single quotes instead
--------------------------------------------------------------------------------

PhpStorm

Please see “PHP Code Sniffer with WordPress Coding Standards Integration” in PhpStorm documentation.

Standards subsets

The project encompasses a super–set of the sniffs that the WordPress community may need. If you use the WordPress standard you will get all the checks. Some of them might be unnecessary for your environment, for example those specific to WordPress VIP coding requirements.

You can use the following as standard names when invoking phpcs to select sniffs, fitting your needs:

  • WordPress — all of the sniffs in the project.
  • WordPress-Core — sniffs that seek to implement the WordPress core coding standards and go no further.
  • WordPress-Extra — WordPress-Core plus extra best practices sniffs, which are not part of core coding standards and could be controversial.
  • WordPress-VIP — WordPress-Core plus sniffs that seek to implement the WordPress VIP coding requirements.

Using custom ruleset

If you need to further customize selection of sniffs for your project — you can create custom ruleset.xml standard. See provided project.ruleset.xml.example file and fully annotated example in PHP_CodeSniffer documentation.

Contributing

See CONTRIBUTING, including information about unit testing.

License

See LICENSE (MIT).