I have installed the MongoDB libary with apt and after this has not worket i have tried to install the libery over pecl install mongodb but this has not helped.
How i can find a tutorial / example for the new libery i think i have used a legacy tutorial what not work with the new one.
https://www.php.net/manual/de/mongo.tutorial.connecting.php
https://www.php.net/manual/de/mongo.tutorial.selectdb.php