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PHPCS (PHP CodeSniffer) is a development tool that ensures your code conforms to a coding standard. It is an essential tool for any development team that wants to ensure their code is consistent and follows best practices.

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Files

PHPCS will run on files with the following extensions:
  • .php

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Features

PHPCS can detect and fix various coding standard violations including:
  • PSR Standards: Enforces PSR-1, PSR-2, PSR-12, and other coding standards
  • Custom Standards: Supports custom coding standards and rules
  • Auto-fixing: Can automatically fix many coding standard violations
  • Custom Rules: Allows creation of custom sniff rules
  • Multiple Standards: Can enforce multiple coding standards simultaneously
PHPCS supports many coding standards including:
  • PSR-1: Basic Coding Standard
  • PSR-2: Coding Style Guide
  • PSR-12: Extended Coding Style
  • Squiz: Squiz Labs coding standard
  • PEAR: PEAR coding standard
  • Zend: Zend Framework coding standard

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Configuration

PHPCS requires a configuration file to run. CodeRabbit will only run PHPCS if one of the following configuration files is found:
  • phpcs.xml - XML configuration file
  • phpcs.xml.dist - Distributed XML configuration file
CodeRabbit will not run PHPCS if no configuration file is found.

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When we skip PHPCS

CodeRabbit will skip running PHPCS when:
  • PHPCS is disabled in the review profile (only runs in Assertive mode).
  • No config file is found (phpcs.xml or phpcs.xml.dist).
  • The config file does not appear to be a valid PHPCS ruleset (missing <ruleset or <?xml tags).

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Profile behavior

PHPCS only runs in Assertive mode. In Chill mode, PHPCS is skipped entirely.