获取表单中multiple select的输入数据

multiple select元素支持选中多个option，如何获取选中的多个值

<!--未订正代码-->
<form action="">
    <label for="">
        高级搜索：
        <select name="id_sp" id="include" multiple="multiple" required>
            @foreach($sp as $v)
                <option value="{{$v['id']}}">{{$v['simple_name']}}</option>
            @endforeach
        </select>
    </label>
    <label for="">
        <select name="" id="uninclude" multiple="multiple" required>>
            <option value="">网易音乐</option>
            <option value="">酷狗音乐</option>
            <option value="">酷我音乐</option>
        </select>
    </label>
    <button type="submit" class="shaixuan">筛选</button>
</form>

如果select的name属性写成上面的形式或者是空，表单提交的值将会是选中的最后一个option。

{
    "id_sp" : "3"
}

<!--订正后的代码-->
<form action="">
    <label for="">
        高级搜索：
        <select name="in_sp[]" id="include" multiple="multiple" required>
            @foreach($sp as $v)
                <option value="{{$v['id']}}">{{$v['simple_name']}}</option>
            @endforeach
        </select>
    </label>
    <label for="">
        <img src="../../../images/icon/连接.png" alt="" class="lianjie">
        <select name="not_sp[]" id="uninclude" multiple="multiple" required>>
            @foreach($sp as $v)
                <option value="{{$v['id']}}">{{$v['simple_name']}}</option>
            @endforeach
        </select>
    </label>
    <button type="submit" class="shaixuan">筛选</button>
</form>

替换后表单数据
[图片上传失败...(image-eaaf4-1541498305280)]