spl_object_hash
Simple example of usage :
<?php
$array = array('Buck','Jerry','Tomas');
$arrayObject = new ArrayObject($array);
// Add new element
$arrayObject->append('Tweety');
// We are getting the iterator of the object
$iterator = $arrayObject->getIterator();
// Simple while loop
while ($iterator->valid()) {
echo $iterator->current() . "\n";
$iterator->next();
}
/* Outputs */
Buck
Jerry
Tomas
Tweety
?>
Note that not all the public methods of this class are documented here .
( Which includes a lot sorting methods ) .
Regards
The ArrayObject class
Wstęp
...
Skrótowy opis klasy
ArrayObject
ArrayObject
implements
IteratorAggregate
,
Traversable
,
ArrayAccess
,
Countable
{
/* Methods */
ArrayObject::__construct
( mixed $input
)
}Spis treści
- ArrayObject::append — Appends the value
- ArrayObject::__construct — Construct a new array object
- ArrayObject::count — Get the number of elements in the Iterator
- ArrayObject::getIterator — Create a new iterator from an ArrayObject instance
- ArrayObject::offsetExists — Returns whether the requested $index exists
- ArrayObject::offsetGet — Returns the value at the specified $index
- ArrayObject::offsetSet — Sets the value at the specified $index to $newval
- ArrayObject::offsetUnset — Unsets the value at the specified $index
add a note
User Contributed NotesArrayObject
Venelin Vulkov
05-Nov-2008 11:09
05-Nov-2008 11:09
tony dot fraser at gmail dot com
09-Oct-2008 06:30
09-Oct-2008 06:30
The code above will pretty much work as it is, though I have since added in some features.
Further notes:
1. Be very aware of this bug until 5.3 becomes stable.
http://bugs.php.net/bug.php?id=41528
Basically, we wrote this collection to be a java-like object cache stored in session (instead of hitting the soap server or a DB all the time) to load objects in $_SESSION['cache'] But, this particular bug will prevent the object from working in the second page. The variable is there, but there's nothing in it.
The easy work around is to upgrade PHP to 5.3, and it works like a charm, but at the moment 5.3 happens to be in alpha mode.
2. You cannot have a PDO object in as a member variable of a class stored in the ArrayObject if you want it to pass through sessions. You can store it if it's not going into a session, but if you want to cache like we're tying to do, make SURE you $_dbHandle="" wherever you need to.
3. My earlier post was just proof of concept. We have it working now so UserCollection extends GenericCollectionAbstract. and GenericCollectionAbstract implements the GenericCollectionInterface. GenericCollectionObject is the object stored in the GenericCollection's $arrayObject data, and is basically just a two property object that holds the ID of the object, and the object itself.
When all is said and done this works like a charm.
page 1 ->
$_SESSION['u'] = new UserCollection();
$_SESSION['u']->getObject(1, $dbWW);
page-2->
echo $_SESSION['u']->getObject(2, $dbWW)->getProperty('email');
And of course, getProperty() is from my user class.
my UserCollecton->getObject overwrite method is as follows:
<?php
public function getObject($_id, $_dbHandle){
//error_log('trying to get object');
if (parent::objectExists($_id)){
return parent::getObject($_id, $_dbHandle);
error_log('returning object');
}
else{
//error_log('collecting new user');
$_tempUser = new User();
if ($_tempUser->populateByID($_id, $_dbHandle)){
parent::addObject($_id, $_tempUser);
if (parent::objectExists($_id)) {
$_return = parent::getObject($_id);
}
else $_return = "";
}
else {
$_return = "";
}
$this->dbHandle=""; //This has to be done, otherwise it's stored in the object as a private var
//and it will break the object if it resides in a session.
return $_return;
}
?>
Shoot me an email if you have any questions.
enjoy.!
tony at tonyandcarol dot com
08-Oct-2008 05:49
08-Oct-2008 05:49
My need was to create a java-like collection where I could store objects by their DB primary keys while having the standard stack capabilities of adding, retrieving, and removing objects from collection. ArrayObject didn't quite do what I need it to do so I extended it a little.
<?php
class GenericCollection extends ArrayObject{
private $data;
function __construct(){
$this->data = new ArrayObject();
}
function addObject($_id, $_object){
$_thisItem = new CollectionObject($_id, $_object);
$this->data->offSetSet($_id, $_thisItem);
}
function deleteObject($_id){
$this->data->offsetUnset($_id);
}
function getObject($_id){
$_thisObject = $this->data->offSetGet($_id);
return $_thisObject->getObject();
}
function printCollection() {
print_r($this->data);
}
}
class CollectionObject {
private $id;
private $object;
function __construct($_id, $_object){
$this->id = $_id;
$this->object = $_object;
}
function getObject(){
return $this->object;
}
function printObject() {
print_r($this);
}
}
?>
Call it like so:
<?php
$u1 = new User/Data/Object (); //whatever, just an object.
$myCollection = new GenericCollection();
$myCollection->addObject(1, $u1);
print_r($myCollection->getObject(1));
?>
Now you have a simple and functional collection framework. Add methods in for specific types of sorting, we just didn't need anything other than primary key access. And you can add introspection into the collection object if you need to track what kind of an object it is.
tony@tonyandcarol.com
dave at csixty4 dot com
05-Sep-2008 06:28
05-Sep-2008 06:28
If you want to use array functions on an ArrayObject, why not use iterator_to_array() to get a standard PHP array? Do your operations on that array, then instantiate a new ArrayObject, passing it the array.
This might be a little slow on large ArrayObjects, but you'd have access to all of the array functions.
Anonymous
10-Aug-2008 04:17
10-Aug-2008 04:17
Too bad the Array functions [1] are not available on this object… otherwise I would be using it all the time.
[1] http://nl.php.net/manual/en/ref.array.php