Breadcrumb PHP class

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<?php

#Breadcrumb List Generator
class Breadcrumb
{
  public static function c()
  {
   static $instance;
   if(!is_object($instance))
   {
    $instance= new Breadcrumb();
   }

   return $instance;
  }

  private function rglob($no,$root)
  {
   #find root firts elements
   $objects = $this->sanitize($no,array_merge(glob("$root*.php",GLOB_NOSORT),glob("$root*",GLOB_ONLYDIR)));
   #find each root first element sub
     foreach ($objects as $object)
     if(is_dir($object) && !is_link($object)) $objects= $this->sanitize($no,array_merge($objects,glob("$object/*",GLOB_NOSORT|GLOB_ONLYDIR)));
   return $objects;
  }

  private function getItems()
  {
    #Exclusions. to exclude unwanted file or dir. add more yourself
    $no=array("error","cgi-",".xml",".txt","_");
    #Translations. add more yourself
    $ts=array("index.php"=>"Portail","index.html"=>"Portail");
    #for breadcrumb items store
    $_barr=array();
    #operating root, script path
    $root=preg_replace('/\b(\w+.php)\b/',"",$_SERVER["SCRIPT_FILENAME"]);
    #uribase
    $uribase="https://".$_SERVER["HTTP_HOST"];//URL
    #docRoot
    $docRoot=$_SERVER["DOCUMENT_ROOT"];

    #only dir aloowed
    if(is_dir($root)){
     #get all dirs, subdirs and files
     $objects = $this->rglob($no,$root);
     foreach($objects as $i=>$object){
       #when $object has valid name 
       if($object != "." && $object != "..")
       {
          #create an array for item real positions from PATH
          $tmp1=array_filter(array_merge(array(0),preg_split('@/@',str_replace($docRoot,"",$object),NULL,PREG_SPLIT_NO_EMPTY)));
          #name
          $n=basename($object);
          #index
          $index=array_search($n,$tmp1);
          #url
          $q=$uribase.str_replace($docRoot,"",$object);
          #translate name
          $n=array_key_exists($n,$ts)?$ts[$n]:$n;
          #breadcrumb item
          $_barr[]="\r\n{\"@type\": \"ListItem\",\r\n\"position\": $index,\r\n\"name\": \"$n\",\r\n\"item\": \"$q\"\r\n}\r\n";
       }
     }
   }

   #implode items with comma and return
   $_barr=implode(",", $_barr);
   return $_barr;
  }

  public function dataLayer()
  {
   #for Google Tag Manager dataLayer
   $g=$this->getItems();

   return "\r\n<script>\r\n(dataLayer= window.dataLayer || []).push({\r\n'SiteBreadcrumb':'allowed',\r\n'Breadcrumb': [$g]\r\n});\r\n</script>\r\n";
  }

  public function List()
  {
   #for Google ld+json directly
   $g=$this->getItems();

   return "\r\n<script type=\"application/ld+json\">\r\n{\r\n\"@context\": \"https://schema.org\"\r\n,\"@type\": \"BreadcrumbList\"\r\n,\"itemListElement\": [$g]}\r\n</script>\r\n";
  }

  private function sanitize($no,$aa)
  {
    #remove unwanted items from glob results
    $f=$aa;
    foreach ($no as $a => $x) {
      foreach ($aa as $b => $y) {
        # code...
        if(strpos($y, $x)!==false)
        unset($f[$b]);
      }
    }

    return array_values($f);
  }

}


?>

Placez ce code avant l'intégration (le plus haut possible) de Google Tag Manager sur vos pages:
1
<?=Breadcrumb::c()->dataLayer()?>


Vous aurez maintenant deux variables (SiteBreadcrumb et Breadcrumb) dans le dataLayer de votre conteneur.

Dans GTM:
Avec la variable SiteBreadcrumb, vous pourrez identifier les pages éligibles avec un déclencheur;
Récupérer ensuite la variable Breadcrumb et avec ce contenu dans une balise personnalisée, tout est joué:

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<script>
(function(){
var ld =
{
 "@context": "http://schema.org",
"@type": "BreadcrumbList",
"itemListElement": {{Breadcrumb}}
};
var s= document.createElement('script');
    s.setAttribute('type', 'application/ld+json');
    s.textContent = JSON.stringify(ld);
document.body.appendChild(s);
})();
</script>

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<?=Breadcrumb::c()->List()?>