DependencyInversionUserDB.php

<?php
//Dependency Inversion SOLID Principle

interface DBConnectionInterface {
    public function connect();
}

class MySQLConnection implements DBConnectionInterface {
  
    public function connect() {
        echo "MySql connect";
    }
}

class OracleConnection implements DBConnectionInterface {
  
    public function connect() {
        echo "Oracle connect";
    }
}

class UserDB {
    private $dbConnection;
    
    public function __construct(DBConnectionInterface $dbConnection) {
        $this->dbConnection = $dbConnection->connect();
    }
  
    public function store() {
    }
}


$object = new UserDB(new OracleConnection());
?>