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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$handle = new Upload(......); if ($handle->uploaded) { $handle->file_new_name_body = '_' . $handle->file_src_name_body; $handle->Process(.......); // ....... }
Before calling process(), you can read $handle->file_src_name_body. Then, you set $handle->file_new_name_body
For instance, do: