goatoh_training_server/modules/chat.mod.php

<?php

class
Chat
{
  public int    $id;
  public int    $user_id;
  public string $pass;

  function
  insert ():
  int
  {
    $sql = "
        INSERT INTO
          chats (
            user_id,
            text)
          VALUES
            ({$this -> user_id},
             '{$this -> text}')";
    $GLOBALS['__db_connection'] -> query ($sql)
        or die ("db_insert error $sql");
  }
}