Running in Travis

To integrate PHPCS with WPCS with Travis CI, you'll need to install both before_install and add the run command to the script. If your project uses Composer, the typical instructions might be different.

If you use a matrix setup in Travis to test your code against different PHP and/or WordPress versions, you don't need to run PHPCS on each variant of the matrix as the results will be same. You can set an environment variable in the Travis matrix to only run the sniffs against one setup in the matrix.

Travis CI example

language: php

matrix:
  include:
    # Arbitrary PHP version to run the sniffs against.
    - php: '7.0'
      env: SNIFF=1

before_install:
  - if [[ "$SNIFF" == "1" ]]; then export PHPCS_DIR=/tmp/phpcs; fi
  - if [[ "$SNIFF" == "1" ]]; then export SNIFFS_DIR=/tmp/sniffs; fi
  # Install PHP_CodeSniffer.
  - if [[ "$SNIFF" == "1" ]]; then git clone -b master --depth 1 https://github.com/squizlabs/PHP_CodeSniffer.git $PHPCS_DIR; fi
  # Install WordPress Coding Standards.
  - if [[ "$SNIFF" == "1" ]]; then git clone -b master --depth 1 https://github.com/WordPress/WordPress-Coding-Standards.git $SNIFFS_DIR; fi
  # Set install path for WordPress Coding Standards.
  - if [[ "$SNIFF" == "1" ]]; then $PHPCS_DIR/bin/phpcs --config-set installed_paths $SNIFFS_DIR; fi
  # After CodeSniffer install you should refresh your path.
  - if [[ "$SNIFF" == "1" ]]; then phpenv rehash; fi

script:
  # Run against WordPress Coding Standards.
  # If you use a custom ruleset, change `--standard=WordPress` to point to your ruleset file,
  # for example: `--standard=wpcs.xml`.
  # You can use any of the normal PHPCS command line arguments in the command:
  # https://github.com/squizlabs/PHP_CodeSniffer/wiki/Usage
  - if [[ "$SNIFF" == "1" ]]; then $PHPCS_DIR/bin/phpcs -p . --standard=WordPress; fi

More examples and advice about integrating PHPCS in your Travis build tests can be found here: https://github.com/jrfnl/make-phpcs-work-for-you/tree/master/travis-examples