Set Selected value after php foreach

Code Sample :

<select name="klas_jaar">
    <?php foreach ($jaren as $jaar):?>
        <option value="<?=$jaar->jaar_id?>"<? if($jaar->jaar_id == $selected_jaar_id) echo " selected"?>><?=$jaar->schooljaar?></option>
    <?php endforeach;?>
</select>

Reference : https://stackoverflow.com/questions/6354329/set-selected-value-after-php-foreach