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cat_term - holds the basic information about single terms.

CREATE TABLE `cat_term` (

  `term_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `name` varchar(200) NOT NULL DEFAULT '',

  `slug` varchar(200) NOT NULL DEFAULT '',

  `term_group` varchar(250) NOT NULL DEFAULT '0',

  PRIMARY KEY (`term_id`),

  UNIQUE KEY `slug` (`slug`),

  KEY `name` (`name`)

) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8

cat_term_taxonomy  - defines the taxonomy - either tag, category, or custom taxonomy

CREATE TABLE `cat_term_taxonomy` (

  `term_taxonomy_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `term_id` bigint(20) unsigned NOT NULL DEFAULT '0',

  `taxonomy` varchar(32) NOT NULL DEFAULT '',

  `description` longtext NOT NULL,

  `parent` bigint(20) unsigned NOT NULL DEFAULT '0',

  `count` bigint(20) NOT NULL DEFAULT '0',

  PRIMARY KEY (`term_taxonomy_id`),

  UNIQUE KEY `term_id_taxonomy` (`term_id`,`taxonomy`),

  KEY `taxonomy` (`taxonomy`)

) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8

Here is the function:

function build_tree_drop($parent_id = 0, $level = 0) {

  $getJoin = mysql_query("SELECT * FROM cat_term_taxonomy INNER JOIN cat_term ON cat_term_taxonomy.term_id=cat_term.term_id WHERE parent='" . $parent_id . "'");

  $getcate = '';
 foreach ($getJoin as $row) {

  //indent as necessary and print name

  $getcate .= '<option value="' . $row->term_id . '" class="level-' . $row->parent . '">';

  $getcate .= str_repeat('&nbsp;&nbsp;&nbsp;', $level) . $row->name . "\n";

  $getcate .= '</option>';

  //we want to see all the children that belong to this

  //node… so we need to call *this* function again

  $getcate .= $this->build_tree_drop($row->term_id, $level + 1);

  }

  return $getcate;

  }

echo $this->Model->build_tree_drop($parent_id = 0, $level = 0); Result:

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