gistfile1.php

//phrase image and youtube links
foreach ($template->query('//article/div/p[a and count(*)=1 and not(normalize-space(text()))]') as $node) {
	$link = trim($node->nodeValue);
	$replace = false;

	if (
		preg_match('~(?:
			https?://(?:www\.)?youtu(?:be\.com/(?:embed/|watch\?(?:.+&)?v=)|\.be/)([a-z0-9_\-]+) # Parsing YouTube URLs.
			|
			(.+\.(?:png|jpe?g|gif|webp)$) # Parsing image URLs.
			|
			(.+\.(?:webm|mp4|mov|3gp|avi)$) # Parsing video URLs.
		)~ixA', $link, $matches)
	) {
		if (strlen($matches[1])) { // We found a YouTube video.
			$replace = '<iframe width="100%" height="360" src="http://www.youtube-nocookie.com/embed/' . $matches[1] . '?autoplay=0&amp;rel=0" frameborder="0" allowfullscreen="allowfullscreen">' . safeHTML($link) . '</iframe>';
		} else if (strlen($matches[2])) { // We found an image link.
			$replace = '<a target="_blank" href="' . safeHTML($link) . '"><img style="max-width: 100%;" src="' . $matches[2] . '" alt="Click to view full size image." /></a>';
          } else if (strlen($matches[3])) { // We found an video link.
			$replace = '<video style="max-width: 100%;" src="' . $matches[3] . '" controls="controls" />';
		}
	}

	if ($replace) {
		$frag = $node->ownerDocument->createDocumentFragment();
		if (!@$frag->appendXML($replace) || !@$node->parentNode->replaceChild($frag, $node)) {
			throw new Exception("Invalid HTML");
		}
	}
}