Something

function proxifyURL($url,$flag='',$absolute=true) {
	global $base, $options;
	
	if ( empty($url) ) return '';
	
	// Ignore anchors
	if ( $url{0} == '#' ) return $url;
	
	// Ignore javascript
	if ( strpos($url,'javascript:') === 0 ) return $url;
	
	// Avoid double proxifying
	if ( strpos($url,optURL) === 0 ) return $url;
	
	// Absolute path from root
	if ( strlen($url) && $url{0} == '/' ) {
		$url = urlHOST . substr($url,1);
	} else if ( strpos($url,'http://') !== 0 && strpos($url,'https://') !== 0 ) {
		if ( $url == '.' )
			$url = '';
		if ( $base ) {
			// Relative from BASE
			$url = $base . $url;
		} else {
			// Relative from document
			$url = urlHOST . urlPATH . $url;
		}
	}
	// Simplify path
	# Strip ./ (refers to current directory)
	$url = str_replace('/./','/',$url);

	if ( strlen($url) > 8 && strpos($url,'//',8) ) 
		$url = preg_replace('#(?<!:)//#','/',$url);

	# Convert ../ (= up a directory)
	if ( strpos($url,'../') ) {
		$parts = explode('/',$url);
		
		// No directories to expand
		if ( count($parts) == 1 ) return $url;
		
		# Continue to loop through array while we still have ..
		while ( in_array('..',$parts) ) {
			// Check each part of the URL
			foreach ( $parts as $key => $level ) {
				// If this is the .., remove it and the previous directory
				// so in effect we've travelled up a directory 
				if ( $level == '..' ) {
					unset($parts[$previous]);
					unset($parts[$key]);
					break;
				}
				// If we remove more than one .. part, keys will no
				// longer be consecutively ordered
				$previous = $key;
			}
		}
		# Return joined URI
		$url = implode('/',$parts);
	}

	// Extract an #anchor
	$jumpTo = '';
	if ( strpos($url,'#') && preg_match('/#(.*)$/',$url,$anchor) ) {
		$jumpTo = $anchor[0];
		$url = str_replace($jumpTo,'',$url);
	}

	// Use base64 to hide target URL
	if ( $options['encodeURL'] ) {
	$uniquekey = "4";
   	global $uniquekey; 
    $array = str_split($url); 
    foreach($array as &$a) 
    { 
        $a = ord($a); 
        $a = $a * $uniquekey; 
    } 
    $url = implode('_',$array); 
    return $url;

}


	$suffix = defined('BITFIELD') ? '&b=' . BITFIELD : '';
	if ( $flag ) $suffix .= '&f='.$flag;
	
	$prefix = $absolute ? optURL : '';

	return $prefix . 'browse.php?u='.$url . $suffix . $jumpTo;

}

// Accepts http://yourproxy.site/browse.php?u=STRING and converts to
// http://www.domain.com/somepage.php
function deproxifyURL($url) {

	// Remove our proxy URI
	$url = str_replace(array(optURL,'browse.php?u='),'',$url);

   global $uniquekey; 
    $array = explode("_", $url); 
    foreach($array as &$a) 
    { 
        $a = $a / $uniquekey; 
        $a = chr($a); 
    } 
    $url = implode('', $array); 

	
	return $url;
}