pabx-app/app/core/Connection.php

<?php

namespace app\core;

use PDO;

class Connection
{
    private static PDO $instance;
    public static function getInstance(): PDO|NULL
    {
        $cd = [];
        if (empty(self::$instance)) {
            $cd = [
                'host_db' => 'postgres',
                'porta_db' => '5432',
                'base_db' => 'pbx',
                'usuario' => 'contacte',
                'senha' => 'ctepgSQL'
            ];
            self::$instance = new PDO(
                "pgsql:host={$cd['host_db']};port={$cd['porta_db']};dbname={$cd['base_db']}",
                $cd['usuario'],
                $cd['senha'],
                [
                    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
                    PDO::ATTR_CASE => PDO::CASE_NATURAL
                ]
            );
        }
        if (self::$instance) {
            return self::$instance;
        }
        return null;
    }
}