PHP Unlimited class Read the implementation code of column classification

  below to share a PHP implementation of unlimited column category reading examples, I hope that the article will bring help to you

The idea of realizing infinite pole column classification: Get the ID (that is, the parent ID) and then get the child ID (that is, the UID child ID) to the database as follows Id:1  uid:0   I am column 1 id:2  uid:1   I am column 2 id:3  uid:1   I am a subclass of column 1   display results:                       &NBS P                          I'm column 1       &NBSP ;                                   &NB Sp      I am a subclass of column 1 I am column 2                   The following is the PHP code     Code As follows: <?php    $query = $this->db->query ("Select * from category");   $list = $query->result ();  foreach ($list as $v) { if ($v->category_id = 0) {//Get parent column (equal to 0 is parent)   $categoryul = anchor ("home/ content/". $v->id, $v->category_name);  echo "<ul>". $categoryul. " </ul> ";   $LISTX = $this->listx->list_id ($v->id);/Displays the specified sub-column  foreach ($listx as $vid) {    $category = anchor ("home/content/") based on the parent ID. $vid->id, $vid-> Category_name);  echo "<li>". $category. " </li> ";   &NBSP}    }  }?>