note 129610 added to index

A better way to implement singleton desygn pattern and resquest data from a json file to connect to a database mysql. this is from my development project. <?php namespace Simulab\Simulab\models\connections; /** * Desygn Pattern: Construction: Singleton method. */ class SimulabConnection { private static $instance = null; private static $pdo = null; private function __construct() { } /** * This method get information like servername, database, user and password from a json file * All The informations about the database connections. */ public static function getJsonData():object{ $filename = '../../config/json/sgbd_informations.json'; if (file_exists($filename)) { $data = file_get_contents($filename); $infodb= json_decode($data); return $infodb; }else{ return null; } } public static function connect():?\PDO{ if (is_null(self::$instance)) { self::$instance = new self; $infodb= self::getJsonData()!=null?self::getJsonData():null; $server= $infodb->server; $database= $infodb->database; $user= $infodb->user; $password= $infodb->password; $options= [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION]; self::$pdo = new \PDO("mysql:host=$server;dbname=$database", $user, $password, $options); } return self::$pdo; } } ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.137 (proxied: 190.115.174.151) ---- Manual Page -- https://php.net/manual/en/index.php Edit -- https://main.php.net/note/edit/129610 Del: integrated -- https://main.php.net/note/delete/129610/integrated Del: useless -- https://main.php.net/note/delete/129610/useless Del: bad code -- https://main.php.net/note/delete/129610/bad+code Del: spam -- https://main.php.net/note/delete/129610/spam Del: non-english -- https://main.php.net/note/delete/129610/non-english Del: in docs -- https://main.php.net/note/delete/129610/in+docs Del: other reasons-- https://main.php.net/note/delete/129610 Reject -- https://main.php.net/note/reject/129610 Search -- https://main.php.net/manage/user-notes.php