Rule no_binary_string There should not be a binary flag before strings. Examples Example #1 --- Original +++ New -<?php $a = b'foo'; +<?php $a = 'foo'; Example #2 --- Original +++ New -<?php $a = b<<<EOT +<?php $a = <<<EOT foo EOT; Rule sets The rule is part of the following rule sets: @PhpCsFixer @Symfony Source class PhpCsFixer\Fixer\StringNotation\NoBinaryStringFixer