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Install the module via composer by running: $ composer require --dev webimpress/coding-standard 
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Add composer scripts into your composer.json:"scripts": { "cs-check": "phpcs", "cs-fix": "phpcbf" } 
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Create file phpcs.xmlin base path of your repository with content:<?xml version="1.0"?> <ruleset name="Webimpress Coding Standard" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="./vendor/squizlabs/php_codesniffer/phpcs.xsd"> <rule ref="./vendor/webimpress/coding-standard/ruleset.xml"/> <!-- Paths to check --> <file>config</file> <file>src</file> <file>test</file> </ruleset> 
As shown above you must define locations or files you want to be checked and fixed by code sniffer. For a reference please see: https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-Ruleset
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To run checks only: $ composer cs-check 
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To automatically fix many CS issues: $ composer cs-fix