将下拉选项存储为将数组元素设置为特定变量

I have the following html:

我有以下html:

<form action="" method="get">
<ul>
    <li>location 
    <select name="locationdo">
        <option value="tax_cb">Checkbox</option>
        <option value="tax_radio">Radio</option>
        <option value="tax_dd">Dropdown</option>
    </select>
    </li>

    <li>genre 
    <select name="genredo">
        <option value="tax_cb">Checkbox</option>
        <option value="tax_radio">Radio</option>
        <option value="tax_dd">Dropdown</option>
    </select>
    </li>

    <li>studio 
    <select name="studiodo">
        <option value="tax_cb">Checkbox</option>
        <option value="tax_radio">Radio</option>
        <option value="tax_dd">Dropdown</option>
    </select>
    </li>
</ul>
<p><input type="submit" value="submit" name="submit" /></p>
</form>
<form