Rule declare_parentheses There must not be spaces around declare statement parentheses. Examples Example #1 --- Original +++ New -<?php declare ( strict_types=1 ); +<?php declare(strict_types=1); Rule sets The rule is part of the following rule sets: @PhpCsFixer @Symfony Source class PhpCsFixer\Fixer\LanguageConstruct\DeclareParenthesesFixer