clarify the problem please...
you want something like below?:
<?php
$submited_numeric_value=3; // you can set it by form; ex:1,2,3.. something numeric
$dodo=array();
$dod=$submited_numeric_value;
settype($dod, "integer");
$dodo[$dod]="selected";
php?>
<select size="1">
<option <?php echo $dodo[1]; php?> value="1111">val1</option>
<option <?php echo $dodo[2]; php?> value="2222">val2</option>
<option <?php echo $dodo[3]; php?> value="3333">val3</option>
<option <?php echo $dodo[4]; php?> value="4444">val4</option>
<option <?php echo $dodo[5]; php?> value="5555">val5</option>
</select>