DB classes with OOP (rewriting code), best solution?

Hi guys,
I'm about to rewriting code using OOP.
I started with the db connection (PDO).

I turned this:

$dsn_test = "mysql:host=localhost;dbname=xxx50;charset=utf8mb4";
$options = [
  PDO::ATTR_EMULATE_PREPARES   => false, // turn off emulation mode for "real" prepared statements
  PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION, //turn on errors in the form of exceptions
  PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC, //make the default fetch be an associative array
];
try...

PHP:

DB classes with OOP (rewriting code), best solution?

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