Don't know how to encapsulate db connection?

Question

PHP

How can I encapsulate the connection to the database? those. move it above the rest of the classes.
and already in the work of other classes to use this connection. and not to produce the sea, yes, I know the singleton pattern is eating, but I still don’t understand it.

Answer 1

Encapsulation is to hide inside, not to take out.
What's wrong with singleton?