lurking

I have a form that lists a bunch of names with a checkbox next to each one. If the checkbox is checked, the data is inserted into my DB.  Whereas previously, the checkbox value was just a variable (user_ID), now I need it to be an array to pass two variables (user_ID + db_designation): [code]<input name="user_ID[]" type="checkbox" id="user_ID[]" value="<?php echo urlencode(serialize(array($row_rsPhysicianDetails['user_ID'], $row_rsPhysicianDetails['db_designation']))); ?>" />[/code] I grab the array data via: [code]<?php $user_id_array = $_POST['user_ID']; ?>[/code] and then have been attempting to insert into my database with a foreach() and nested if() loop. [code]<?php if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "attendance")) {   foreach($user_id_array as $value)   {   list($user, $designation) = unserialize($value);   if ($designation == "p") {   $query = "INSERT INTO course_complete (user_ID, course_ID, course_date, credit_hours, course_session)" . "VALUES($user, '$c_ID', '$c_date', '$credit_hours', '$course_session')";   @mysql_query($query);   }   } ?> [/code] At this time, the insert is not working.  Also, when I tried to see if the data was even being collected via: [code] <?php $user_id_array = $_POST['user_ID']; echo '<pre>'; print_r($_POST); echo '</pre>'; ?> [/code] the result was an empty array: Array { } I would appreciate any ideas for making sure the variable $user_id_array is populating appropriately, and then making the insert work with the foreach, if, serialize and list syntax.  Thank you.