PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::makeClassyInheritancePartMultiLine PHP Method

    private function makeClassyInheritancePartMultiLine(Tokens $tokens, $startIndex, $endIndex)
    {
        for ($i = $endIndex; $i > $startIndex; --$i) {
            $previousInterfaceImplementingIndex = $tokens->getPrevTokenOfKind($i, array(',', array(T_IMPLEMENTS), array(T_EXTENDS)));
            $breakAtIndex = $tokens->getNextMeaningfulToken($previousInterfaceImplementingIndex);
            // make the part of a ',' or 'implements' single line
            $this->makeClassyDefinitionSingleLine($tokens, $breakAtIndex, $i);
            // make sure the part is on its own line
            $isOnOwnLine = false;
            for ($j = $breakAtIndex; $j > $previousInterfaceImplementingIndex; --$j) {
                if (false !== strpos($tokens[$j]->getContent(), "\n")) {
                    $isOnOwnLine = true;
                    break;
                }
            }
            if (!$isOnOwnLine) {
                if ($tokens[$breakAtIndex - 1]->isWhitespace()) {
                    $tokens[$breakAtIndex - 1]->setContent($this->whitespacesConfig->getLineEnding() . $this->whitespacesConfig->getIndent());
                } else {
                    $tokens->insertAt($breakAtIndex, new Token(array(T_WHITESPACE, $this->whitespacesConfig->getLineEnding() . $this->whitespacesConfig->getIndent())));
                }
            }
            $i = $previousInterfaceImplementingIndex + 1;
        }
    }