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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           $nodeChildID; // huhh      public function Structure($nodeID, $nodeName, $nodeChildID) {      if(!(Structure::nodeExists($nodeID))) {         $this->nodeID = $nodeID;         $this->nodeName = $nodeName;         $this->nodeChildID = $nodeChildID; // 0 means its parent node         Structure::$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>";            //Structure::printChildNodes($nodeID);         }      }   }}$node2 = new Structure(4,"Links",0);$node1 = new Structure(2,"Forum",0);$node2 = new Structure(3,"Lol",2);$node3 = new Structure(5,"SubSub",3);Structure::printTree();?>