first version of the website, it works as intended.

functions.php

@@ -0,0 +1,27 @@
+<?php
+    require_once ( 'config.php' );
+    function db_connect ( ) {
+        global $config;
+        $connection = new MySQLi ( $config [ 'db' ] [ 'host' ], $config [ 'db' ] [ 'username' ], $config [ 'db' ] [ 'password' ], $config [ 'db' ] [ 'name' ], $config [ 'db' ] [ 'port' ] );
+        if ( $connection->connect_errno ) {
+            die ( "Database connection failed." );
+        }
+        return $connection;
+    }
+    function db_prepare ( MySQLi $connection, string $query ) {
+        if ( ! ( $statement = $connection -> prepare ( $query ) ) ) {
+            die ( "Prepare failed: (" . $connection->errno . ") " . $connection->error );
+        }
+        return $statement;
+    }
+    function db_bind ( MySQLi_stmt $statement, array $params ) {
+        if ( ! call_user_func_array ( array ( $statement, "bind_param" ), array_merge ( $params [ 0 ], $params [ 1 ] ) ) ) {
+            die ( "Binding parameters failed: (" . $statement->errno . ") " . $statement->error );
+        }
+    }
+    function db_execute ( $statement ) {
+        if ( ! $statement->execute ( ) ) {
+            die ( "Execute failed: (" . $statement->errno . ") " . $statement->error );
+        }
+    }
+?>