src/Debug/Output/Html.php
protected function dumpString($val)
    {
        if (\is_numeric($val)) {
            $date = $this->checkTimestamp($val);
            if ($date) {
                $this->wrapAttribs['class'][] = 'timestamp';
                $this->wrapAttribs['title'] = $date;
            }
        } else {
            if ($this->sanitize) {
                $val = $this->debug->utf8->dump($val, true, true);
                $val = $this->visualWhiteSpace($val);
            } else {
                $this->wrapAttribs['class'][] = 'no-pseudo';
                $val = $this->debug->utf8->dump($val, true, false);
            }
        }
        return $val;
    }
protected function dumpString($val)
    {
        if (\is_numeric($val)) {
            $date = $this->checkTimestamp($val);
            if ($date) {
                $this->wrapAttribs['class'][] = 'timestamp';
                $this->wrapAttribs['title'] = $date;
            }
        } else {
            if ($this->sanitize) {
                $val = $this->debug->utf8->dump($val, true, true);
                $val = $this->visualWhiteSpace($val);
            } else {
                $this->wrapAttribs['class'][] = 'no-pseudo';
                $val = $this->debug->utf8->dump($val, true, false);
            }
        }
        return $val;
    }
Dump string

@param string $val string value

@return string