表格检查信息并在同一页面上插入

So I've got a regular form

所以我有一份常规表格

<form action="includes/send.php" method="post" onsubmit="return isValidForm()" />>

<h1>Opgeven workshops</h1>

<label for="name">Voornaam:</label>
<input type="text"  autocomplete="off" id="name" name="firstname">
<label class="choice" data-id="1"><input type="checkbox" name="group1" value="use your apple1">use your apple<span class="left" ></span>
</label>---more stuff more stuff more stuff--
<for