Rule single_line_comment_spacing Single-line comments must have proper spacing. Examples Example #1 --- Original +++ New <?php -//comment 1 -#comment 2 -/*comment 3*/ +// comment 1 +# comment 2 +/* comment 3 */ Rule sets The rule is part of the following rule sets: @PhpCsFixer @Symfony Source class PhpCsFixer\Fixer\Comment\SingleLineCommentSpacingFixer