Infinite classification classes implement collapsible navigation instances (recommended)

Nonsense not much to say, direct sticker code.

1, database

　　

2, function

　　

function get_str ($id = 0) {global $str; $m = m ("Category", "sp_", "DB_CONFIG1"), $result = $m->where (Array ("pid" = = $id )->select ();//The subclass of the query PID if ($result) {//If there is a subclass $str. = ' <ul> '; foreach ($result as $row) {$str. = "<li>". $ row[' name ']. "</li>"; Build string Get_str ($row [' id ']); Call Get_str (), pass the ID parameter in the recordset into the function, and continue querying the subordinate} $str. = ' </ul> ';} return $STR;}

3, call procedure

3-1 controller inside:

function index () {$str = Get_str (); $this->assign ("str", $STR);        $this->display ();    }

3-2 inside the template:

　　

<div>  {$str}  </div>

4, Show results

　　

We look at the HTML code:

　　

Infinite classification classes implement collapsible navigation instances (recommended)