Youtubede izledigim kişiyle aynı kodlar ama olmuyor bir türlü
https://www.youtube.com/watch?v=asMDsjW3bPw
hmtl<!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"> <link rel="stylesheet" href="cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css"> <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script> <link rel="stylesheet" type="text/css" href="DataTables/datatables.min.css"/> <script type="text/javascript" src="DataTables/datatables.min.js"></script></head>
<body><div class="container">
<div> <form action="">
<textarea name="content" id="content" cols="30" rows="10"></textarea>
</form>
</div>
</div>
<script type="text/javascript" src="ckeditor/ckeditor.js"></script><script> CKEDITOR.replace( 'content', { height: 300, filebrowserUploadUrl: "upload.php" });</script><!-- Optional JavaScript --><!-- jQuery first, then Popper.js, then Bootstrap JS --><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></body></html>UPLOAD.PHP<?php if(isset($_FILES['upload']['name'])){
$file = $_FILES['upload']['tmp_name'];
$file_name = $_FILES['upload']['name'];
$file_name_array = explode(".", $file_name);
$extension = end($file_name_array);
$new_image_name = rand() . '.' . $extension;
chmod('upload', 0777);
$allowed_extension = array("jpg", "gif", "png");
if(in_array($extension, $allowed_extension))
{ move_uploaded_file($file, 'upload/' . $new_image_name);
$function_number = $_GET['CKEditorFuncNum'];
$url = 'upload/' . $new_image_name;
$message = '';
echo "<script type='text/javascript'>window.parent.CKEDITOR.tools.callFunction($function_number, '$url', '$message');</script>";
}}
?>