I use an integrated php environment (xampp)
What I write is a form submission php. A separate php can be opened (entered in the browser), but once submitted, it becomes a download. Please solve.

<form method="post" action="index2.php">

Username:<input type="text" name="usernmae"/>< br>
Password: <input type="password" name="password"/><br>
Verification code: <input type="text" name="code" size="5 "/>1234<br>
Email:<input type="text" name="email"><br>
Introduction:<textarea rows="6" cols="25" name="content"></textarea><br>
<input type="submit" name="send" value="Submit">

</form>