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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$foo = new Upload($_FILES['form_field']); if ($foo->uploaded) { $foo->file_new_name_body = 'foo'; $foo->Process('/home/user/files/'); if ($foo->processed) { echo 'file_dst_name_body : '. $foo->file_dst_name_body; } else { echo 'error : ' . $foo->error; } }