php 与jquery 选中select

php代码，显示出select。

<select class="form-control" name="sort" id="select_sort">

<?php foreach ($sort as $key => $s) {
echo '<option value="'.$s['id'].'">'.$s['name'].'</option>';
}

        ?>
</select>

使用jquery选中

$(function(){
var is_select_id = "<?php echo $is_select_id;?>";
$('#select_sort option[value="'+is_select_id+'"').attr('selected',true);

})