The ArrayObject class

Introduction

...

Class synopsis

ArrayObject

ArrayObject implements IteratorAggregate , Traversable , ArrayAccess , Countable {

/* Methods */

ArrayObject::__construct ( mixed $input )

void ArrayObject::append ( mixed $newval )

int ArrayObject::count ( void )

ArrayIterator ArrayObject::getIterator ( void )

bool ArrayObject::offsetExists ( mixed $index )

mixed ArrayObject::offsetGet ( mixed $index )

void ArrayObject::offsetSet ( mixed $index , mixed $newval )

void ArrayObject::offsetUnset ( mixed $index )

}

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

ArrayObject::append

ArrayIterator::valid

Last updated: Fri, 10 Oct 2008

add a note User Contributed Notes
ArrayObject

tony at tonyandcarol dot com
08-Oct-2008 04:49


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 05:28


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 03:17


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

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