folds into a space like a newline does. private function inline(\DOMNode $node) { return trim(preg_replace('/[\s' . self::SOFT . ']*[\n' . self::SOFT . '][\s' . self::SOFT . ']*/', ' ', $this->children($node))); } // List items keep line breaks but a soft break is a plain newline there. private function itemContent(\DOMNode $node) { $content = str_replace(self::SOFT, "\n", $this->children($node)); return trim(preg_replace('/\n{2,}/', "\n", $content)); } // Keep the surrounding spaces outside the markers: "a **b** c", not "a** b **c". private function wrap(\DOMNode $node, $marker) { $raw = $this->children($node); $text = trim($raw); if ($text === '') { return $raw; } $lead = preg_match('/^\s/u', $raw) ? ' ' : ''; $trail = preg_match('/\s$/u', $raw) ? ' ' : ''; return $lead . $marker . $text . $marker . $trail; } private function pre(\DOMElement $node) { // Some editors put
inside

; textContent would drop them.
        foreach (iterator_to_array($node->getElementsByTagName('br')) as $br) {
            $br->parentNode->replaceChild($node->ownerDocument->createTextNode("\n"), $br);
        }

        $text = str_replace(["\r\n", "\r", "\xC2\xA0"], ["\n", "\n", ' '], $node->textContent);
        $text = trim($text, "\n");
        if (trim($text) === '') {
            return '';
        }

        $this->preBlocks[] = "```\n" . $text . "\n```";

        return "\n\n" . self::PRE . (count($this->preBlocks) - 1) . self::PRE . "\n\n";
    }

    private function link(\DOMElement $node)
    {
        $text = $this->inline($node);
        $href = trim($node->getAttribute('href'));

        if ($href === '' || $href[0] === '#' || stripos($href, 'javascript:') === 0) {
            return $text;
        }

        $bareHref = preg_replace('#^(mailto:|tel:)#i', '', $href);
        if ($text === '' || $text === $href || $text === $bareHref) {
            return $bareHref;
        }

        return '[' . $text . '](' . $href . ')';
    }

    private function image(\DOMElement $node)
    {
        // Tracking pixels.
        if (in_array($node->getAttribute('width'), ['0', '1'], true) || in_array($node->getAttribute('height'), ['0', '1'], true)) {
            return '';
        }

        $alt = trim(preg_replace('/\s+/', ' ', $node->getAttribute('alt')));
        $src = trim($node->getAttribute('src'));

        if ($src === '' || stripos($src, 'data:') === 0) {
            return $alt !== '' ? '[image: ' . $alt . ']' : '[image]';
        }

        return '![' . $alt . '](' . $src . ')';
    }

    private function listBlock(\DOMElement $node, $ordered)
    {
        $lines  = [];
        $number = $ordered && is_numeric($node->getAttribute('start')) ? (int) $node->getAttribute('start') : 1;

        foreach ($node->childNodes as $child) {
            if (!$child instanceof \DOMElement || strtolower($child->tagName) !== 'li') {
                // Stray text or a nested list without an  wrapper.
                $stray = trim($this->node($child));
                if ($stray !== '') {
                    $lines[] = $stray;
                }
                continue;
            }

            $prefix  = $ordered ? ($number++) . '. ' : '- ';
            $content = $this->itemContent($child);
            $indent  = str_repeat(self::INDENT, strlen($prefix));

            $lines[] = $prefix . str_replace("\n", "\n" . $indent, $content);
        }

        return $lines ? "\n\n" . implode("\n", $lines) . "\n\n" : '';
    }

    private function blockquote(\DOMElement $node)
    {
        $content = trim(self::tidy($this->children($node)));
        if ($content === '') {
            return '';
        }

        return "\n\n> " . str_replace("\n", "\n> ", $content) . "\n\n";
    }

    private function table(\DOMElement $node)
    {
        $rows = [];
        foreach ($this->tableRows($node) as $tr) {
            $cells = [];
            foreach ($tr->childNodes as $cell) {
                if ($cell instanceof \DOMElement && in_array(strtolower($cell->tagName), ['td', 'th'], true)) {
                    $cells[] = $cell;
                }
            }
            if ($cells) {
                $rows[] = $cells;
            }
        }

        if (!$rows) {
            return $this->children($node);
        }

        $columns = max(array_map('count', $rows));

        // Email layout tables (nested tables, single column) read better as plain blocks.
        if ($columns < 2 || $node->getElementsByTagName('table')->length > 0) {
            $out = '';
            foreach ($rows as $cells) {
                foreach ($cells as $cell) {
                    $out .= self::SOFT . trim($this->children($cell)) . self::SOFT;
                }
            }
            return "\n" . $out . "\n";
        }

        $lines = [];
        foreach ($rows as $index => $cells) {
            $values = [];
            foreach ($cells as $cell) {
                $values[] = str_replace('|', '\|', $this->inline($cell));
            }
            $values  = array_pad($values, $columns, '');
            $lines[] = '| ' . implode(' | ', $values) . ' |';

            if ($index === 0) {
                $lines[] = '|' . str_repeat(' --- |', $columns);
            }
        }

        return "\n\n" . implode("\n", $lines) . "\n\n";
    }

    /**
     * Rows of this table only, not of tables nested inside its cells.
     *
     * @return \DOMElement[]
     */
    private function tableRows(\DOMElement $table)
    {
        $rows = [];
        foreach ($table->childNodes as $child) {
            if (!$child instanceof \DOMElement) {
                continue;
            }
            $tag = strtolower($child->tagName);
            if ($tag === 'tr') {
                $rows[] = $child;
            } elseif (in_array($tag, ['thead', 'tbody', 'tfoot'], true)) {
                foreach ($child->childNodes as $tr) {
                    if ($tr instanceof \DOMElement && strtolower($tr->tagName) === 'tr') {
                        $rows[] = $tr;
                    }
                }
            }
        }

        return $rows;
    }
}

````