PhpCsFixer\Fixer\ArrayNotation\WhitespaceAfterCommaInArrayFixer::fixSpacing PHP Method

    private function fixSpacing($index, Tokens $tokens)
    {
        if ($tokens[$index]->isGivenKind(CT::T_ARRAY_SQUARE_BRACE_OPEN)) {
            $startIndex = $index;
            $endIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_ARRAY_SQUARE_BRACE, $startIndex);
        } else {
            $startIndex = $tokens->getNextTokenOfKind($index, array('('));
            $endIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $startIndex);
        }
        for ($i = $endIndex - 1; $i > $startIndex; --$i) {
            $i = $this->skipNonArrayElements($i, $tokens);
            if ($tokens[$i]->equals(',') && !$tokens[$i + 1]->isWhitespace()) {
                $tokens->insertAt($i + 1, new Token(array(T_WHITESPACE, ' ')));
            }
        }
    }