KODLARIM:
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script type="text/javascript" src="ckeditor/ckeditor.js"></script>
<title>Hello, world!</title>
</head>
<body>
<?php
if($_POST):
$baslik = $_POST["baslik"];
$altbaslik = $_POST["altbaslik"];
$metin = $_POST["aciklama"];
echo $baslik."<br>".$altbaslik."<br>".$metin;
else:
?>
<div class="container">
<form class="form-group" method="POST" action="">
<label class="form-control-label">Başlık</label>
<input class="form-control" type="text" name="baslik">
<label class="form-control-label">Alt_Başlık</label>
<input class="form-control" type="" name="altbaslik">
<label class="form-control-label">Metin</label>
<textarea class="form-control" id="editor1" name="aciklama"></textarea>
<input type="submit" class="btn btn-danger" value="gonder" name="">
</form>
</div>
<?php
endif;
?>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<script type="text/javascript">
CKEDITOR.replace('editor1');
</script>
</body>
</html>