class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
more info about the class
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session_start()'
$_SESSION ['imgURL'] = $filename . "_thumb";
Hey, instead of the file_new_name_body, use the file_body_name_add = "_thumb"
that will add the _thumb like this file_thumb.jpg
the way you have it will look like this filenamejpg_thumb.jpg
hope this helps