Phphineas

I have some very simple code in a PHP web application that is something like this: <select name="my_select" id="my_select" value=""> <option value=""></option> <option value="1">Pass</option> <option value="0">Fail</option> </select> if (empty($_POST['myselect'])) { // if no select value is chosen, field value = current value $field_value = $_REQUEST['field_value']; } else { // else set field value to select value $field_value = $_POST['select_value']; } $sql = "update my table set field_value = :field_value"; If the user chooses a value from the select list, that value is used to update a table. If the select value is empty, the field value stays as is. A button triggers the update query. This has been working fine until today. Now, if the user selects a value, the field is updated to 1 / Pass. But if the button is clicked again and no value is chosen, the field is automatically updated to the opposite value, 0 / Fail. I can't figure out why this is suddenly happening after it worked correctly for so long. Any input you may have would be appreciated.