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<?php# Simple Tree structureclass Structure {      private static $treeList; // Holding our nodes   private $nodeID, // like the name says           $nodeName, // well da =D           $nodeChildID, // huhh		   $nodeLevel; //mitmenda järgu nod      public function Structure($nodeID, $nodeName, $nodeChildID, $nodeLevel) {      if(!(Structure::nodeExists($nodeID))) {         $this->nodeID = $nodeID;         $this->nodeName = $nodeName;         $this->nodeChildID = $nodeChildID; // 0 means its parent node		 $this->nodeLevel = $nodeLevel;         Structure::$treeList[] = $this;      } else {         // idk perhaps throwing an error      }   }            public static function nodeExists($nodeID) {      if(is_array(Structure::$treeList)) {         foreach(Structure::$treeList as $key => $obj) {              if($obj->nodeID == $nodeID) return true;          }        }     return false;   }         public static function printTree() {      $parent = Structure::findParentNodes();      foreach($parent as $id => $obj) {         // So lets print all that node childs         echo "Rootnode: <b>{$obj->nodeName}</b>[ID : <b>{$obj->nodeID}</b>] <br>";         Structure::printChildNodes($obj->nodeID);      }   }      public static function findParentNodes() {      $countID = 0;      foreach(Structure::$treeList as $key => $obj)         if($obj->nodeChildID == 0) $parentNodes[$obj->nodeID] = $obj;               return $parentNodes;   }      public static function printChildNodes($nodeID) {      foreach(Structure::$treeList as $id => $obj) {         if($obj->nodeChildID == $nodeID) {            echo " - Childnode : <b>{$obj->nodeName}</b>[ID : <b>{$obj->nodeID}</b>] (SubID : {$obj->nodeChildID})<br>";			 $lapsed = Structure::kontrolli_lapsi($obj->nodeID);			 if($lapsed){				 foreach($lapsed as $lapse_id){					 echo '  --';					Structure::printNode($lapse_id);				 }			 }            //Structure::printChildNodes($nodeID);         }      }	  echo '<br>';   }   public static function asd(){	   var_dump(Structure::$treeList);   }   public static function printNode($ID_p){	   foreach(Structure::$treeList as $id => $obj) {		   if($obj->nodeID == $ID_p){			   echo ' Noot: <b>'.($obj->nodeName).'</b>[ID : <b>'.($obj->nodeID).'</b>] (SubID : '.($obj->nodeChildID).')<br>';		   }	   }   }   public static function kontrolli_lapsi($ID){	   $lapsed = array();      foreach(Structure::$treeList as $id => $obj) {		  if($obj->nodeChildID == $ID){			   array_push($lapsed, $obj->nodeID);		  }	  }	  return $lapsed;   }}new Structure(1,"Esimene",0,0);new Structure(3,"esimese-nod1",1,1);new Structure(4,"esimese2-nod2",3,1);new Structure(5,"esimese2-nod3",3,1);new Structure(6,"esimese3-nod1",4,1);new Structure(7,"Teine",0,0);new Structure(8,"teise-nod1",7,1);Structure::printTree();Structure::asd();?>