goatoh_training_server/modules/user.mod.php

<?php

class
User
{
  public int    $id;
  public string $name;
  public string $pass;
  public string $inheritance_code;

  public static function
  find (
      int $id):
  Self
  {
    $sql = "
        SELECT
          *
        FROM
          users
        WHERE
          id = $id";
    $result = $GLOBALS['__db_connection'] -> query ($sql)
        or die ("db_select error $sql");
    $row = $result -> fetch_array ();

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

    return $self;
  }

  public function
  insert ():
  Self
  {
    $sql = "
        INSERT INTO
          users (
            name,
            pass,
            inheritance_code,
            created_at,
            modified_at)
          VALUES
            ('{$this -> name}',
             '{$this -> pass}',
             '{$this -> inheritance_code}',
             NOW(),
             NOW())";
    $GLOBALS['__db_connection'] -> query ($sql)
        or die ("db_insert error $sql");

    $this -> id = $GLOBALS['__db_connection'] -> insert_id;

    return $this;
  }
}