goatoh_training_server/modules/user.mod.php

<?php

class
User
{
  private $db;

  private $id;
  var     $name;
  var     $pass;

  function
  __construct ()
  {
    $config = include ('./config.php');

    $db_host = $config['host'];
    $db_port = $config['port'];
    $db_user = $config['user'];
    $db_pass = $config['pass'];

    $this -> db = new mysqli ($db_host, $db_user, $db_pass, 'goatoh_training',
                              $db_port);
  }

  public static function
  find (
      int $id):
  Self
  {
    $sql = "
        SELECT
          *
        FROM
          user
        WHERE
          id = $id";
    $result = $this -> db -> query ($sql) or die ("db_select error $sql");

    $row = $this -> db -> fetch_array ($result);

    $self = new Self;
    $self -> id = $id;
    $self -> name = $row['name'];
    $self -> pass = $row['pass'];

    return $self;
  }
}