This is a feature of the language. There's no reason to not trust it. A lot of websites are running just fine counting on PHP to close their stuff.
As programmers, of course, we want to close it ourselves. That's fine. But opening and closing a database connection for every query is a horrible idea.
The better way to do it is to call open() from your constructor, and rename your close() to destruct() . According to the documentation destruct will be called "as soon as all references to a particular object are removed or when the object is explicitly destroyed or in any order in shutdown sequence." Sounds like an ideal place to stash away the closing code for your database connection.
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