At 11:43 06.09.2002, Tom Oram wrote:
>Hi,
>
>In the Zend Engine I assume each (referenced) variable has some sort of
>reference counter so that when the last reference is lost the memory is freed
>up, am I right? If I am has anyone ever suggested or are there any plans to
>make this available to the php scripts, this goes for the object pointers (or
>whatever you call them) in the Zend 2 Engine.
>
>This would be extremely useful if you had a object loader which either
>loaded a
>object from the database or returned the already loaded object, but cleanup up
>automatically (if that made any sense). Here is some code to explain:
>
><?
>// This is Zend Engine 1 Code
>
>/*
> * Object to be loaded
> */
>class MyObject {
> var $id;
> var $someParam;
>}
>
>/*
> * Object loader class
> */
>class ObjectLoader {
> var $objects = array();
>
> // Example load function
> function &loadFromDatabase($id) {
> $res = mysql_query("
> select id,someParam
> from database
> where id=$id
> ");
>
> $row = mysql_fetch_row($res);
>
> $obj = new MyObject;
>
> $obj->id = $row[0];
> $obj->someParam = $row[1];
>
> return $obj;
> }
>
> function &loadById($id) {
> // Check if the object is already loaded, if not load it
> if (!isset($objects[$id]))
> $this->objects[$id] =& $this->loadFromDatabase($id);
>
> // Return the object
> return $this->objects[$id];
> }
>
> // Session serialise handler
> function __sleep() {
> foreach ($this->objects as $id => $objCpy) [
> // Check if this is the last reference to the object
> if (get_reference_count($this->objects[$id])) {
This should be get_reference_count(...) == 1
> // there are no other references to this object
> // so it is unused so we can clear up
> unset($this->objects[$id]);
> }
> }
> }
>}
>?>
>
>With this code you could create an object loader and store it in session then
>load objects from it, (store the references in session if you want), then
>get as
>may references to the same objects just by calling koadById() and you could be
>happy that when you have finished with an object it won't stay in you session
>causing bloat!
>
>Hope you understood that. Obviously if these reference counters don't exist
>then this has been a wasted post but I think its a nice idea.
>
>Cheers
>Tom
>
>--
>
>***************************************************
>Tom Oram
>SCL Computer Services
>URL http://www.scl.co.uk/
>***************************************************
>
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