GraphQL\Error\SyntaxError::highlightSourceAtLocation PHP Method

    public static function highlightSourceAtLocation(Source $source, SourceLocation $location)
    {
        $line = $location->line;
        $prevLineNum = (string) ($line - 1);
        $lineNum = (string) $line;
        $nextLineNum = (string) ($line + 1);
        $padLen = mb_strlen($nextLineNum, 'UTF-8');
        $unicodeChars = json_decode('"\\u2028\\u2029"');
        // Quick hack to get js-compatible representation of these chars
        $lines = preg_split('/\\r\\n|[\\n\\r' . $unicodeChars . ']/su', $source->body);
        $lpad = function ($len, $str) {
            return str_pad($str, $len - mb_strlen($str, 'UTF-8') + 1, ' ', STR_PAD_LEFT);
        };
        return ($line >= 2 ? $lpad($padLen, $prevLineNum) . ': ' . $lines[$line - 2] . "\n" : '') . ($lpad($padLen, $lineNum) . ': ' . $lines[$line - 1] . "\n") . (str_repeat(' ', 1 + $padLen + $location->column) . "^\n") . ($line < count($lines) ? $lpad($padLen, $nextLineNum) . ': ' . $lines[$line] . "\n" : '');
    }