Configuring PHP_CodeSniffer in PhpStorm

1. Navigae to Preferences > Languages & Frameworks > PHP > Quality Tools and expand the PHP_CodeSniffer section and select Configuration to Local like following
   

2. Next, we have to set the binary paths of PHP_CodeSniffer. For that click on the three dots button next to Configuration dropdown and then inside the opened dialog set the phpcs and phpcbf binary paths:
   

3. Finally we have to enable the PHP_CodeSniffer in the IDE by navigating to Preferences > Editor > Inspections > PHP > Quality Tools and enable the PHP CS Fixer validation and PHP_CodeSniffer validation.