NEW: Creating Database.php class to assign all responsability of DB connection in this archive.

app/models/Database.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\models;
+
+class Database
+{
+
+    private $hostname;
+    private $username;
+    private $password;
+    private $database;
+    private static $connection = null;
+    public function __construct()
+    {
+
+        $this->hostname = $_ENV['DB_HOST'];
+        $this->username = $_ENV['DB_USER'];
+        $this->password = $_ENV['DB_PASSWORD'];
+        $this->database = $_ENV['DB'];
+    }
+
+    public function dbConnect()
+    {
+
+
+        if (self::$connection === null) {
+            try {
+                self::$connection = new \PDO(
+                    'mysql:host=' . $this->hostname . ';' .
+                        'dbname=' . $this->database . ';' .
+                        'charset=utf8mb4',
+                    $this->username,
+                    $this->password
+                );
+                self::$connection->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
+            } catch (\PDOException $e) {
+                return json_encode(['error' => 'Erro na conexão com o banco ' . $e->getMessage()]);
+            }
+        }
+        return self::$connection;
+    }
+}