<button type="submit" class="btn" name="create_post">Save Post</button> code example

Example: using post from any button

$('.btn-logout').on('click', function() {
		$('<form action="<?=$url_local?>member/logout" method="post"> <input name="token" value="<?= $obj_user ? $obj_user['token'] : '' ?>"/> </form>').appendTo('body').submit();
	});