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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The filename could be like fa1d4367ede6a6e732d8bd0188841d25.jpg
Is it because of php settings or verot settings?
thanks a lot.
Maybe your disk is full? Did you add enctype="multipart/form-data" in your FORM tag?