populating multi-dimensional array

long-time reader, first-time poster. I am trying to use PEAR's 'hierselect' in HTML_Quickform. I have category and subcategory tables. I want to populate a drop-down based on category, then populate the subcategory based on the user's category selection. mysql> desc category; +--------+-------------+------+-----+---------+----------------+

| Field  | Type        | Null | Key | Default | Extra          |

+--------+-------------+------+-----+---------+----------------+

| cat_id | int(11)     | NO   | PRI | NULL    | auto_increment |
| name   | varchar(30) | YES  |     | NULL    |                |

+--------+-------------+------+-----+---------+----------------+ 2 rows in set (0.00 sec) mysql> desc subcategory; +-------+-------------+------+-----+---------+----------------+

| Field | Type        | Null | Key | Default | Extra          |

+-------+-------------+------+-----+---------+----------------+

| sc_id | tinyint(4)  | NO   | PRI | NULL    | auto_increment |
| name  | varchar(30) | YES  |     | NULL    |                |
| cat   | tinyint(4)  | YES  |     | NULL    |                |

+-------+-------------+------+-----+---------+----------------+ 3 rows in set (0.01 sec) here's what I *THINK* the code should look like: **************************************************************************************************** 9 $form = new HTML_QuickForm('catForm','POST'); 10 11 $form->addElement('header', null, 'Add a New Category'); 12 13 $main = array(); 14 $secondary = array(); 15 16 $query1 = "SELECT * FROM category"; 17 $result1 = $db->query($query); 18 while ($result->fetchInto($row1)) {

19    $main[($row1[0])] = $row1[1];

20 } 21 22 for ($i = 0; $i < count($main); $i++) {

23    $query2 = "SELECT * FROM subcategory WHERE cat = " . $i;
24    $result2 = $db->query($query2);
25    $while ($result2->fetchInto($row2)) {
26      $secondary[$i][] = $row2[1];
27    }

28 } 29 30 $sel =& $form->addElement('hierselect', 'cats', 'Categories: '); 31 $sel->setMainOptions($main); 32 $sel->setSecOptions($secondary); 33 $form->addElement('submit', 'btnSubmit', 'Submit'); 34 35 $form->display(); ******************************************************************************************************** but I keep getting "unexpected '[' on line 25" is there a problem with populating the $secondary array that way? thanks, matt