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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$this->file_dst_name_body = str_replace(array(' ', '-'), array('_','_'), $this->file_dst_name_body) ; $this->file_dst_name_body = ereg_replace('[^A-Za-z0-9_]', '', $this->file_dst_name_body) ;
$this->file_dst_name_body = str_replace(array(' '), array('_'), $this->file_dst_name_body) ; $this->file_dst_name_body = ereg_replace('[^A-Za-z0-9_-]', '', $this->file_dst_name_body) ;
But in the code, you can replace
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