OXPUS.de

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// Link relationships
	define('INTERNAL_LINK_REL', '');
	define('EXTERNAL_LINK_REL', 'nofollow');

	// Link targets
	define('INTERNAL_LINK_TARGET', '');
	define('EXTERNAL_LINK_TARGET', '_blank');

	// Link classes
	define('INTERNAL_LINK_CLASS', 'postlink-local');
	define('EXTERNAL_LINK_CLASS', '');

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a:link	{ color: #CD2626; text-decoration: none; }
a.postlink-local:link {color: #898989; text-decoration:none; }

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<a href="link">Text</a>
<a href="link" class="postlink-local">Text</a>

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a:link	{ color: #CD2626; text-decoration: none; }
a:visited	{ color: #CD2626; text-decoration: none; }
a:hover	{ color: #CD2626; text-decoration: underline; }
a:active	{ color: #CD2626; text-decoration: none; }

/*postlink-local */
a.postlink-local:link {color: #898989; text-decoration:none; }
a.postlink-local:visited {color: #898989; text-decoration:none; }
a.postlink-local:hover {color: #d2d2d2; text-decoration:underline; }
a.postlink-local:active {color: #d3d3d3; text-decoration:none; }

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<?php
* Make sure this file has not already been included.
*/
if (!defined('INCLUDES_PRIME_LINKS'))
{
	define('INCLUDES_PRIME_LINKS', true);

	// Options
	define('ALL_SUBDOMAINS_INTERNAL', true);
	define('ANONYMIZE_EXTERNAL_LINKS', 'http://anonym.to?');

	// Link relationships
	define('INTERNAL_LINK_REL', '');
	define('EXTERNAL_LINK_REL', 'nofollow');

	// Link targets
	define('INTERNAL_LINK_TARGET', '');
	define('EXTERNAL_LINK_TARGET', '_blank');

	// Link classes
	define('INTERNAL_LINK_CLASS', 'postlink-local');
	define('EXTERNAL_LINK_CLASS', '');


	/**
	* Decodes all HTML entities (html_entity_decode() doesn't decode numberical entities).
	*/
	function decode_entities($text) 
	{
		$text = html_entity_decode($text, ENT_QUOTES, 'ISO-8859-1'); 		//UTF-8 does not work!
		$text = preg_replace('/&#(\d+);/me', 'chr($1)', $text); 			//decimal notation
		$text = preg_replace('/&#x([a-f0-9]+);/mei', 'chr(0x$1)', $text);	//hex notation
		return($text);
	}


	/**
	* Removes subdomains from a URL.
	*/
	function remove_subdomains($url)
	{
		$url = preg_replace('#^(http|https)://[^/]+?\.((?:[a-z0-9-]+\.[a-z]+)|localhost/)#i', '$1://$2', $url);
		return($url);
	}


	/**
	* Determines if a URL is local or external.
	*/
	function is_link_local($url, $board_url = false)
	{
		if ($board_url === false)
		{
			$board_url = generate_board_url(true);
			$board_url = ALL_SUBDOMAINS_INTERNAL ? remove_subdomains($board_url) : $board_url;
		}

		$is_local = (strpos($url, $board_url) === 0);
		if (!$is_local)
		{
			$protocol = substr($url, 0, strpos($url, ':'));
			$is_local = !$protocol || ($protocol && !in_array($protocol, array('http', 'https', 'mailto', 'ftp', 'gopher')));
		}
		return($is_local);
	}

	/**
	*/
	function prime_links($message)
	{
		// A quick check before we start using regular expressions
		if (strpos($message, '<a ') === false)
		{
			return($message);
		}
		$board_url = generate_board_url(true);
		$board_url = ALL_SUBDOMAINS_INTERNAL ? remove_subdomains($board_url) : $board_url;
		preg_match_all('/(<a[^>]+?>)/i', $message, $matches, PREG_SET_ORDER);
		foreach ($matches as $links)
		{
			$is_local 	= false;
			$link		= $new_link = $links[0];
			$href		= preg_replace('/^.*href="([^"]*)".*$/i', '$1', $link);
			if ($href == $link) //no link was found
			{
				continue;
			}
			$href		= decode_entities($href);
			$href 		= ALL_SUBDOMAINS_INTERNAL ? remove_subdomains($href) : $href;

			$is_local 	= is_link_local($href, $board_url);
			$new_class	= $is_local ? INTERNAL_LINK_CLASS  : EXTERNAL_LINK_CLASS;
			$new_target	= $is_local ? INTERNAL_LINK_TARGET : EXTERNAL_LINK_TARGET;
			$new_rel	= $is_local ? INTERNAL_LINK_REL    : EXTERNAL_LINK_REL;

			if ($new_class)
			{
				$class		= preg_replace('/^.*class="([^"]*)".*$/i', '$1', $link);
				$class		= $class == $link ? '' : $class; // Was class found?
				$old_class	= $class == 'postlink' ? '' : $class;
				$new_class	= trim(implode(' ', array_unique(array_merge(explode(' ', $old_class), (array)$new_class))));	// This will append the new class instead of replacing the existing one. 
				$new_link	= $class ? str_replace("class=\"$class\"", "class=\"$new_class\"", $new_link) : str_replace('>', " class=\"$new_class\">", $new_link);
			}

			if ($new_target)
			{
				$click		= preg_replace('/^.*onclick="([^"]*)".*$/i', '$1', $link);
				$click		= $click == $link ? '' : $click; // Was onclick found?
				$new_click  = "this.target='$new_target';";
				$new_link	= $click ? str_replace("onclick=\"$click\"", "onclick=\"$new_click\"", $new_link) : str_replace('>', " onclick=\"$new_click\">", $new_link);

				// The target attribute is not allowed in STRICT doctypes. If you want to use it anyway, just uncomment the following lines.
			//	$target	= preg_replace('/^.*target="([^"]*)".*$/i', '$1', $link);
			//	$target	= $target == $link ? '' : $target; // Was target found?
			//	$new_link	= $target ? str_replace("target=\"$target\"", "target=\"$new_target\"", $new_link) : str_replace('>', " target=\"$new_target\">", $new_link);
			}

			if ($new_rel)
			{
				$rel		= preg_replace('/^.*rel="([^"]*)".*$/i', '$1', $link);
				$rel 		= $rel == $link ? '' : $rel; // Was rel found?
				$new_rel	= trim(implode(' ', array_unique(array_merge(explode(' ', $rel), (array)$new_rel))));	// This will append the new rel instead of replacing the existing one. 
				$new_link	= $rel ? str_replace("rel=\"$rel\"", "rel=\"$new_rel\"", $new_link) : str_replace('>', " rel=\"$new_rel\">", $new_link);
			}

			if (!$is_local && ANONYMIZE_EXTERNAL_LINKS)
			{
				$new_link	=  str_replace('href="', 'href="' . ANONYMIZE_EXTERNAL_LINKS, $new_link);
			}
			$searches[]		= $link;
			$replacements[]	= $new_link;
		}
		$message = str_replace($searches, $replacements, $message);
		return($message);
	}
}
?>

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<div class="content"><a href="http://anonym.to?http://www.google.de" class="postlink" onclick="this.target='_blank';" rel="nofollow">google</a></div>

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define('EXTERNAL_LINK_CLASS', 'postlink');

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/*postlink */
a.postlink:link {color: #CD2626; }
a.postlink:visited {color: #CD2626; }
a.postlink:hover {color: #CD2626; }
a.postlink:active {color: #CD2626; }