如何使用逗号分隔值进行搜索

Question

我有5个复选框，

    <label class="checkbox-inline"><input type="checkbox" name="manhattan" value="Manhattan" >Manhattan</label>
    <label class="checkbox-inline"><input type="checkbox" name="bronx" value="Bronx" >Bronx</label>
    <label class="checkbox-inline"><input type="checkbox" name="brooklyn" value="Brooklyn" >Brooklyn</label>
    <label class="checkbox-inline"><input type="checkbox" name="queen" value="Queen" >Queen</label>

我想搜索

---------------------------------
id   |        location
---------------------------------
1    |  Manhattan,Brooklyn,Queen
2    |  Queen,Brooklyn
---------------------------------

这是我的查询

extract($_POST);
$locprefervals = $manhattan.",".$bronx.",".$brooklyn.",".$queen.",".$staten;
$locprefer = rtrim($locprefervals,',');

$query = "select * from tbl where location='".$locprefer ."'";

当用户在复选框中选中某个位置时，我需要比较每个逗号分隔值的表格“location”中的数据。