add basic util for php connection to the db

<?php

    session_start();

    $dsn = "mysql:host=localhost;dbname=Rubrica;charset=utf8";

    $pdo = new PDO(

        $dsn,

        "5h_bovo",

        "123456",

        [

            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,

            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_NUM

        ]

    );

    function getRubrica() {

        if (!isset($_SESSION["key"])) {

            return [];

        }

        $query = "SELECT * FROM Rubrica WHERE sessionKey = :key";

        $stmt = $pdo->prepare($query);

        $stmt->bindParam(":key", $_SESSION["key"], PDO::PARAM_STR);

        $stmt->execute();

        return $stmt->fetchAll();        

    }

?>

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