You have two separate forms, but assuming you were trying to test two different methods, this should show you the way.
<!DOCTYPE html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>
<div class="btn-group" role="group" aria-label="...">
<form method="post">
<input type="text" name="test" id="test" class="btn btn-info" /><br/>
<input type="submit" name="post_submit" value="Submit via Post" />
</form>
</div>
<div class="formoutline">
<form method="get">
<input name="test" type="text" id="subject2" class="form-control" />
<input type="submit" name="get_submit" value="Submit via Get" />
</form>
</div>
<?php
echo 'Get Form: ' . (filter_input(INPUT_GET, 'test') ?: 'Not Submitted') . '<br />';
echo 'Post Form: ' . (filter_input(INPUT_POST, 'test') ?: 'Not Submitted') . '<br />';
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