 Re: Using Arrays in PHP
ArrayIterator is the Component of SPL, here explained detailed about SPL and Iterators...
what is Standard PHP Library (SPL)?
SPL provides a standard set of interfaces for PHP5. The aim of SPL is to implement some efficient data access interfaces and classes for PHP. Functionally it is designed to traverse aggregate structures (anything you want to loop over). These may include arrays, database result sets, xml trees, directory listings or any list at all. Currently SPL deals with Iterators. To see all the classes available to SPL, this simple snippet will show you.
<?php
// a simple foreach() to traverse the SPL class names
foreach(spl_classes() as $key=>$value)
{
echo $key.' -> '.$value.'<br />';
}
?>
What are iterators?
An Iterator is an object that traverses a structure eg: an array or a directory listing or possibly a set of database result sets or other resource. This is not an accurate discription, but more will become clear later by way of example. There are different types of iterators for dealing with different types of data such as array Iterators, Directory Iterators and more. Here we will begin to get familiar with them beginning with the DirectoryIterator. What is important to note is they can all be accessed with a standard interface. This means that regardless of the data type, access to the information is standardised. This is a real step forward for PHP.
ArrayIterator
The ArrayIterator makes use of the ArrayObject to traverse arrays and an understanding of this is important. Much like the Directory iterator, we can see the methods available to the Array Iterator with a simple snippet.
<?php
foreach(get_class_methods(new ArrayIterator()) as $key=>$method)
{
echo $key.' -> '.$method.'<br />';
}
?>
__________________
Thanks & Regards
Sabari...
Last edited by Sabari : 08-21-2007 at 09:50 PM.
|