The entries in $_FILES will be stored with the name of the tag from your HTML form.Your form element is named userfile, so the array will have the following contents: n The value stored in $_FILES[‘userfile’][‘tmp_name’] is the place where the file has been temporarily stored on the web server. n The value stored in $_FILES[‘userfile’][‘name’] is the file’s name on the user’s system. n The value stored in $_FILES[‘userfile’][‘size’] is the size of the file in bytes. n The value stored in $_FILES[‘userfile’][‘type’] is the MIME type of the file—for example, text/plain or image/gif. n The value stored in $_FILES[‘userfile’][‘error’] will give you any error codes associated with the file upload.This functionality was added at PHP 4.2.0. ------解决方案-------------------- tmp_name,那是个随机的文件名
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