如何将php变量传递给同一页面中的另一种形式？

我在同一个php页面中有两种形式。我必须先以第一种形式保存这些值，然后再将其保存到数据库中，然后才能以下一种形式使用这些值。

第一种形式的PHP代码：

<?php
    include 'config.php';
    if(isset($_POST['documentRequest']))
    {
        $date = $_POST['reqDate'];
        $name = $_POST['name'];

        $insertSql = mysqli_query($conn, "INSERT INTO documentrequest(Person_idPerson, docrequest_date) VALUES ('$name', '$date');");

        //$sql = "INSERT into requestitem (DocumentRequest_idDocumentRequest, Document_idDocument) VALUE ((SELECT idDocumentRequest FROM documentrequest WHERE Person_idPerson = 6), 2)";

        header("Refresh: 2; url=doc_request.php");
        mysqli_close($conn);

    }
?>

这是我的第一个表格：

<form class="form-horizontal form-label-left" name = "documentRequest" enctype="multipart/form-data" role="form" method="post" novalidate>

    <div class = "first">
    <div class="item form-group">
        <label class="control-label col-md-3 col-sm-3 col-xs-12">ID <span class="required">*</span></label>
        <div class="col-md-6 col-sm-6 col-xs-12">
            <input id="name" class="form-control col-md-7 col-xs-12" placeholder ="Type in ID number " name="name" required="required" type="number">
        </div>
    </div>

    <div class="ln_solid"></div>
    <div class="form-group">
        <div class="col-md-6 col-md-offset-3">
            <button id="requestDiv" type="submit" class="btn btn-success" name="documentRequest" >Proceed</button>
            <button type="submit" class="btn btn-primary">Cancel</button>
        </div>
    </div>
    </div>
</form>

第二种形式（在另一个div内）：

<form class="form-horizontal form-label-left" name = "documentRequest" enctype="multipart/form-data" role="form" method="post" novalidate>
    <div class = "second">
        <div class="item form-group">
            <label class="control-label col-md-3 col-sm-3 col-xs-12"> Document Request(s)  <span class="required">*</span></label>
        <div class="col-md-6 col-sm-6 col-xs-12">
            <div class = "clearfix"></div>
            <p>Minimum of 1:<p>
            <input type="checkbox" name="docs[]" id="doc1" value="Certificate of Residency" /> Certificate of Residency
            <br/>
            <div class = "col-xs-3">
    <input name="d1" class="form-control col-md-7 col-xs-12" required="required" type="number">
                </div>
    <div class = "clearfix"></div>

    <input type="checkbox" name="docs[]" id="doc2" value="Barangay Clearance"  /> Barangay Clearance                                                    
    <br />
    <div class = "col-xs-3">
    <input name="d2" class="form-control col-md-7 col-xs-12" required="required" type="number">
    </div>


    <input id="a" class="form-control col-md-7 col-xs-12" name="a" value = "<?php echo isset($_POST['name'])? $_POST['name'] : "";?>" required="required" type="text">
    </div>
    </div>
    <div class="ln_solid"></div>
    <div class="form-group">
        <div class="col-md-6 col-md-offset-3">
            <button id="requestDiv" type="submit" class="btn btn-success" name="documentRequest" >Proceed</button>
            <button type="submit" class="btn btn-primary">Cancel</button>
    </div>
    </div>
</form>

基本上，我需要以下一种形式使用ID的值，以便它知道它属于哪个ID。下一个表单基本上是关于用户的请求的（一系列复选框）。我怎样才能做到这一点？请帮我。谢谢你。