java - How do we add values in a Dependency Injection controller?

I have a data access object (DAO) class and need to inject it in a few models.

$dao = new DAO("mysql", "username", "password")
$userModel = new UserModel($dao);
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Using dependency injection is very important to me. So it should look something like this:

//My DAO class
class DAO($connection, $username, $password) {
    $this->connection = $connection;
    $this->username = $username;
    $this->password = $password;
}

//My user model that I am injection the DAO class into
class UserModel(DAO $dao) {     //Where should i add my connection/username and password?
    $this->dao = $dao;
}
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Unfortunately, I cannot find a way to specify my connection and credentials in the constructor. I would also like to use the same instance of the DAO and UserModel elsewhere.

Question: How can I specific different connections/credentials to different models/services and keep the same DAO instance?

P.S. I've looked at pimple, laravel DI, Spring... but cannot seem to find a good solution.