come si usa questa funzione

[Samleo]

C'ho provato io....

function resolve_url($base, $url) {         
if (!strlen($base)) 
    return $url;         // Step 2        
if (!strlen($url)) 
   return $base;         // Step 3         
if (preg_match('!^[a-z]+:!i', $url)) 
   return $url;         
$base = parse_url($base);        
 if ($url{0} == "#") {                 
// Step 2 (fragment)                 
   $base['fragment'] = substr($url, 1);                 
      return unparse_url($base);         
}         
unset($base['fragment']);        
unset($base['query']);         
if (substr($url, 0, 2) == "//") {                 
// Step 4                 
   return unparse_url(array('scheme'=>$base['scheme'],'path'=>$url,));         
} 
else if ($url{0} == "/") {                 
// Step 5                 
$base['path'] = $url;         
} 
else {                 
// Step 6                 
$path = explode('/', $base['path']);                 
$url_path = explode('/', $url);                 
// Step 6a: drop file from base                 
array_pop($path);                
 // Step 6b, 6c, 6e: append url while removing "." and ".." from                 
// the directory portion                 
$end = array_pop($url_path);                 
foreach ($url_path as $segment) {                         
   if ($segment == '.') {                                 
      // skip                         
   } 
   else if ($segment == '..' && $path && $path[sizeof($path)-1] != '..'){                            
     array_pop($path);                         
   } 
   else {                                 
   $path[] = $segment;                         
   }                 
}                 
// Step 6d, 6f: remove "." and ".." from file portion                 
if ($end == '.') {                         
   $path[] = '';                 
} 
else if ($end == '..' && $path && $path[sizeof($path)-1] != '..') {                         
   $path[sizeof($path)-1] = '';                 
} 
else {                         
   $path[] = $end;                 
}                 
// Step 6h                 
$base['path'] = join('/', $path);          
}         // Step 7        
 return unparse_url($base);