thinkphp implements file upload and file download

This article mainly shares with you thinkphp's implementation of file upload and file download, combining graphics, text and code, hoping to help everyone.

File upload (the key is the path)

1. Write an upload method

2.Write the code inside (Set individual codes inside)

## ID to remove duplicates (the key is 1, first put the ID number in Obtained from the database, 2 is to determine whether the student ID exists, 3 directly determines if it does not exist and imports it. If it exists, it will show that the student ID already exists and the upload fails)

If successful, the upload will be displayed

File download

1. Write a download method download

2. The page displays

#. The problem with file download lies in the file path of the file tag.

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