- Replaced ternary notation with null coalescing version.
- Removed unnecessary semi-colon
- Replaced `<? echo` with short echo ``<?=`
- declared stay_open explicitly with `let`
- Updated PHPdocs
- Replaced force_download() from the CI3 download helper with CI4 version
- Removed unneeded using statements
- added needed call to db_connect()
- Removed parameter that matches the default value since it's redundant.
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