rss-bridge/docs/01_General/03_Requirements.md

  - PHP 7.4 (or higher)
  - [`openssl`](https://secure.php.net/manual/en/book.openssl.php) extension
  - [`libxml`](https://secure.php.net/manual/en/book.libxml.php) extension (enabled by default, see [PHP Manual](http://php.net/manual/en/libxml.installation.php))
  - [`mbstring`](https://secure.php.net/manual/en/book.mbstring.php) extension
  - [`simplexml`](https://secure.php.net/manual/en/book.simplexml.php) extension
  - [`curl`](https://secure.php.net/manual/en/book.curl.php) extension
  - [`json`](https://secure.php.net/manual/en/book.json.php) extension
  - [`filter`](https://secure.php.net/manual/en/book.filter.php) extension
  - [`zip`](https://secure.php.net/manual/en/book.zip.php) (for some bridges)
  - [`sqlite3`](http://php.net/manual/en/book.sqlite3.php) extension (only when using SQLiteCache)

Enable extensions by un-commenting the corresponding line in your PHP configuration (`php.ini`).