breadcrumbs con microformat o RDF piccolo aiutino..

<?php
function breadcrumbs($separator = ' &raquo; ', $home = 'Home') {

    $path = array_filter(explode('/', parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)));
    $base_url = substr($_SERVER['SERVER_PROTOCOL'], 0, strpos($_SERVER['SERVER_PROTOCOL'], '/')) . '://' . $_SERVER['HTTP_HOST'] . '/';
    $breadcrumbs = array("<a href=\"$base_url\">$home</a>");
    $tmp = array_keys($path);
    $last = end($tmp);
    unset($tmp);

    foreach ($path as $x => $crumb) {
        $title = ucwords(str_replace(array('.php', '_'), array('', ' '), $crumb));
	if ($x == 1){
	        $breadcrumbs[]  = "<a href=\"$base_url$crumb\">$title</a>";
	}elseif ($x > 1 && $x < $last){
		$tmp = "<a href=\"$base_url";
		for($i = 1; $i <= $x; $i++){
			$tmp .= $path[$i] . '/';
		}
                $tmp .= "\">$title</a>";
		$breadcrumbs[] = $tmp;
		unset($tmp);
        }else{
                $breadcrumbs[] = "$title";
	}
    }

    return implode($separator, $breadcrumbs);
}	
echo breadcrumbs();

?>

/* Inizio funzione breadcrumbs*/
function breadcrumbs($separator = ' <i class="fa fa-angle-right"></i> ', $home = '<i class="fa fa-home"></i> Home') {

    $path = array_filter(explode('/', parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)));
	$finalurl="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    $base_url = substr($_SERVER['SERVER_PROTOCOL'], 0, strpos($_SERVER['SERVER_PROTOCOL'], '/')) . '://' . $_SERVER['HTTP_HOST'] . '/';
    $breadcrumbs = array("<span typeof='v:Breadcrumb'><a href=\"$base_url\" rel='v:url' property='v:title'>$home</a>");
    $tmp = array_keys($path);
    $last = end($tmp);
    unset($tmp);

    foreach ($path as $x => $crumb) {
        $title = ucwords(str_replace(array('.php', '_'), array('', ' '), $crumb));
	if ($x == 1){
	        $breadcrumbs[]  = "<span typeof='v:Breadcrumb'><a href=\"$base_url$crumb\" rel='v:url' property='v:title'>$title</a></span>";
	}elseif ($x > 1 && $x < $last){
		$tmp = "<span typeof='v:Breadcrumb'><a href=\"$base_url";
		for($i = 1; $i <= $x; $i++){
			$tmp .= $path[$i] . '/';
		}
                $tmp .= "\" rel='v:url' property='v:title'>$title</a></span>";
		$breadcrumbs[] = $tmp;
		unset($tmp);
        }else{
                $breadcrumbs[] = "<span typeof='v:Breadcrumb'><a href=\"$finalurl\" rel='v:url' property='v:title'>$title</a></span>";
	}
    }

    return implode($separator, $breadcrumbs);
}	

/* Fine funzione breadcrumbs*/

<?php
$cont = 1;
while ($cont <= $x) {
  echo "</span></span>";
  $cont++;
}
?>

<div xmlns:v="http://rdf.data-vocabulary.org/#"> 
  <span typeof="v:Breadcrumb">
    <a href="http://www.example.com/books" rel="v:url" property="v:title">
      
      Libri
    </a> ›
    <span rel="v:child">         
          
      <span typeof="v:Breadcrumb">
        <a href="http://www.example.com/books/authors" rel="v:url" property="v:title">
          
          Autori
        </a> ›
        <span rel="v:child">         
                   
          <span typeof="v:Breadcrumb">
            <a href="http://www.example.com/books/authors/stephenking" rel="v:url" property="v:title">
              
              Stephen King
            
            </a> ›   
<!-- Da qui si dovrebbe iniziale a chiudere aggiungendo 2  span per ogni livello del link. Aggiungendo il ciclo alla fine di ogni link mi appaiono stranamente dopo il link base del sito.. -->       
          </span>
        </span>
      </span>
    </span>
  </span>
</div>