add Redis for cache and Mysqli for database query

classes/class_db_mysqli.php

@@ -0,0 +1,67 @@
+<?php
+
+class DBMysqli implements DBInterface
+{
+    private mysqli $mysqli;
+
+    public function connect($host, $username, $password, $database, $port)
+    {
+        $mysqli = new mysqli($host, $username, $password, $database, $port);
+        /* check connection */
+        if (mysqli_connect_errno()) {
+            throw new \RuntimeException(mysqli_connect_error());
+        }
+        /* activate reporting */
+        $driver = new mysqli_driver();
+        $driver->report_mode = MYSQLI_REPORT_ALL & ~MYSQLI_REPORT_INDEX;
+
+        return $this->mysqli = $mysqli;
+    }
+
+    public function query(string $sql)
+    {
+        return $this->mysqli->query($sql);
+    }
+
+    public function error(): string
+    {
+        return $this->mysqli->error;
+    }
+
+    public function errno(): int
+    {
+        return $this->mysqli->errno;
+    }
+
+    public function numRows($mysqliResult): int
+    {
+        return $mysqliResult->num_rows;
+    }
+
+    public function selectDb($database)
+    {
+        return $this->mysqli->select_db($database);
+    }
+
+    public function fetchAssoc($mysqliResult): array|null
+    {
+        return $mysqliResult->fetch_assoc();
+    }
+
+    public function fetchRow($mysqliResult): array|null
+    {
+        return $mysqliResult->fetch_row();
+    }
+
+    public function affectedRows(): int
+    {
+        return $this->mysqli->affected_rows;
+    }
+
+    public function escapeString(string $string): string
+    {
+        return $this->mysqli->real_escape_string($string);
+    }
+
+
+}