PhpCsFixer\Fixer\Casing\LowercaseConstantsFixer::fix PHP Метод

    public function fix(\SplFileInfo $file, Tokens $tokens)
    {
        foreach ($tokens as $index => $token) {
            if (!$token->isNativeConstant()) {
                continue;
            }
            if ($this->isNeighbourAccepted($tokens, $tokens->getPrevMeaningfulToken($index)) && $this->isNeighbourAccepted($tokens, $tokens->getNextMeaningfulToken($index))) {
                $token->setContent(strtolower($token->getContent()));
            }
        }
    }