Looking for a tutorial on how to create a simple text editor? [closed]

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I'm looking for a tutorial(s) on how to create a simple text editor. I'm using PHP, MySQL and Jquery on my site?

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a simple text editor

<?
if ($_POST) {
  file_put_contents("file.txt",$_POST['text']);
  header ("Location: ".$_SERVER['PHP_SELF']);
  exit;
}
$text = htmlspecialchars(file_get_contents("file.txt"));
?>
<form method="POST">
<textarea name="text"><?=$text?></textarea>
<input type="submit">
</form>

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why not just use http://ckeditor.com or any of the many other existing editors. Reinventing the wheel is dumb

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I wouldn't call it tutorial, but I think Mozilla's Midasdemo is a good entry.

Specification: http://www.mozilla.org/editor/midas-spec.html
Demo: http://www.mozilla.org/editor/midasdemo/