PhpCsFixer\Fixer\ArrayNotation\NoWhitespaceBeforeCommaInArrayFixer::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);
            $currentToken = $tokens[$i];
            $prevIndex = $tokens->getPrevNonWhitespace($i - 1);
            if ($currentToken->equals(',') && !$tokens[$prevIndex]->equals(array(T_END_HEREDOC))) {
                $tokens->removeLeadingWhitespace($i);
            }
        }
    }