src/Tokenizer/TokensAnalyzer.php
public function isArrayMultiLine($index)
    {
        if (!$this->isArray($index)) {
            throw new \InvalidArgumentException(sprintf('Not an array at given index %d.', $index));
        }

        $tokens = $this->tokens;

        // Skip only when its an array, for short arrays we need the brace for correct
        // level counting
        if ($tokens[$index]->isGivenKind(T_ARRAY)) {
            $index = $tokens->getNextMeaningfulToken($index);
        }

        $endIndex = $tokens[$index]->equals('(')
            ? $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $index)
            : $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ARRAY_SQUARE_BRACE, $index)
        ;

        for (++$index; $index < $endIndex; ++$index) {
            $token = $tokens[$index];
            $blockType = Tokens::detectBlockType($token);

            if ($blockType && $blockType['isStart']) {
                $index = $tokens->findBlockEnd($blockType['type'], $index);

                continue;
            }

            if (
                $token->isWhitespace() &&
                !$tokens[$index - 1]->isGivenKind(T_END_HEREDOC) &&
                false !== strpos($token->getContent(), "\n")
            ) {
                return true;
            }
        }

        return false;
    }
public function isArrayMultiLine($index)
    {
        if (!$this->isArray($index)) {
            throw new \InvalidArgumentException(sprintf('Not an array at given index %d.', $index));
        }

        $tokens = $this->tokens;

        // Skip only when its an array, for short arrays we need the brace for correct
        // level counting
        if ($tokens[$index]->isGivenKind(T_ARRAY)) {
            $index = $tokens->getNextMeaningfulToken($index);
        }

        $endIndex = $tokens[$index]->equals('(')
            ? $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $index)
            : $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ARRAY_SQUARE_BRACE, $index)
        ;

        for (++$index; $index < $endIndex; ++$index) {
            $token = $tokens[$index];
            $blockType = Tokens::detectBlockType($token);

            if ($blockType && $blockType['isStart']) {
                $index = $tokens->findBlockEnd($blockType['type'], $index);

                continue;
            }

            if (
                $token->isWhitespace() &&
                !$tokens[$index - 1]->isGivenKind(T_END_HEREDOC) &&
                false !== strpos($token->getContent(), "\n")
            ) {
                return true;
            }
        }

        return false;
    }
Check if the array at index is multiline.

This only checks the root-level of the array.

@param int $index

@return bool