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Here is a basic process for creating a file uploading system using PHP:

First, create an HTML form that allows users to select and upload files. This form should include an input field of type "file".
Once the form is submitted, use PHP to process the uploaded file. The $_FILES superglobal variable contains all of the information about the uploaded file.
Check to make sure the uploaded file is a valid file type and does not exceed a specified file size limit.
Use PHP to move the uploaded file from the temporary location where it was first stored to a permanent location on the server.
Optionally, you may want to store information about the uploaded file in a database, such as the file name, file type, and file location on the server.
Finally, display a confirmation message to the user that their file has been uploaded successfully.

Some additional considerations when creating a file uploading system using PHP include:

Adding security measures to prevent malicious files from being uploaded
Creating a system for organizing and managing uploaded files on the server
Handling errors and providing feedback to users if there are issues with the file upload process.