Thank you for your contribution. I wouldn't suggest your squeeze all your changes into one-single commit. Instead, it is better to git checkout -b a new branch, have several commits, each commit is dedicated for its purpose, and merge to your master branch.

1. The code needs to be better formatted. e.g. Some has additional blank lines, and the code indention is not consistent.
2. some functions are hard to understand without comments, for example: tambah
3. The sleep(3); in upload() is a code smell.
4. You have mixed the PHP logics code and HTML presentation. It is better to use some PHP frameworks to separate the logics from UI.

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