append object to another object in php

I have this object:

开发者_C百科foreach(range(1,$oc->num_users) as $num) {
    $user = 'user' . $num;
    $$user = mysql_fetch_object(mysql_query("SELECT user".$num.", user".$num."_ready,  FROM oc_db WHERE leader='".$_SESSION['username']."' ")); 

This gives objects named user1..X

later I have a simular function like this, where I use the $$user->$user that represent a username to connect to the db to get additional information.

   $$user = mysql_fetch_object(mysql_query("SELECT x, y, z FROM user_db WHERE username='".$$user->$user."' "));

This also makes objects named user1..X, but instead of replacing the object created earlier I want to append this values to the object I created in the first function. $$user is the name of the objects. I would like to do something like $$user .= fetch_object in the last function, but off course it's not that simple.

In order to append one object to another you simply need to iterate through the first object and then assign each property you find to the second one:

$tmp = mysql_fetch_object(mysql_query("SELECT x, y, z FROM user_db WHERE username='".$$user->$user."' "));

foreach ($tmp as $key => $value) {
    $$user->$key = $value;
}

As a couple of asides, if you are trying to access the user property of the object, then you should use $$user->user, as $$user->$user will be trying to access a numbered property (e.g. for object $user12, you're trying to access $user12->user12). I would also consider using an array, as fredley suggested (i.e. use $user[$num] instead of $user = 'user'.$num).

To approach your original question, instead of using the .= concatenation assignment operator, you could try adding a method to your user class, such as append, then using it to append the fetched object to your current object like $user->append( fetch_object(...));. In the append method, you can define your own rules for how a fetched object is added to your current user object.