An overview of SPL, presented at the PHP London user group on 7th May 2009, in preparation for TestFest (http://phplondon.org/wiki/May_9th_2009).

1.
An Introduction to SPL ,
the S tandard P HP L ibrary
Robin Fernandes ( [email_address] / @rewbs )

7.
Without Iterators
...
...
Algorithms:
...
...
...
...
...
...
Sum:
Average:
Display:
Collections:
1
2
3
4
1
4
5
3
2

8.
With Iterators
...
Collections:
Algorithms:
...
Iterators:
Algorithms are
decoupled
from collections!
1
2
3
4
1
4
5
3
2

10.
Iterators in PHP
class MyList
implements IteratorAggregate {
private $nodes = ...;
function getIterator() {
return new MyListIterator( $this );
}
}
class MyGraph
implements IteratorAggregate {
private $nodes = ...;
private $edges = ...;
function getIterator() {
return new MyGraphIterator( $this );
}
}
function show( $collection ) {
foreach ( $collection as $node ) {
echo &quot; $node <br/>&quot; ;
}
}
echo show( new MyList);
echo show( new MyGraph);

12.
SPL Iterators
Iterator decorators:
AppendIterator
CachingIterator
FilterIterator
InfiniteIterator
IteratorIterator
LimitIterator
MultipleIterator (5.3)
NoRewindIterator
ParentIterator
RegexIterator
RecursiveIteratorIterator
RecursiveCachingIterator
RecursiveFilterIterator
RecursiveRegexIterator
RecursiveTreeIterator (5.3)
Concrete iterators:
ArrayIterator
RecursiveArrayIterator
DirectoryIterator
RecursiveDirectoryIterator
EmptyIterator
FilesystemIterator (5.3)
GlobIterator (5.3)
Unifying interfaces:
RecursiveIterator
SeekableIterator
OuterIterator

15.
SPL Iterators
Iterator decorators:
AppendIterator
CachingIterator
FilterIterator
InfiniteIterator
IteratorIterator
LimitIterator
MultipleIterator (5.3)
NoRewindIterator
ParentIterator
RegexIterator
RecursiveIteratorIterator
RecursiveCachingIterator
RecursiveFilterIterator
RecursiveRegexIterator
RecursiveTreeIterator (5.3)
Concrete iterators:
ArrayIterator
RecursiveArrayIterator
DirectoryIterator
RecursiveDirectoryIterator
EmptyIterator
FilesystemIterator (5.3)
GlobIterator (5.3)
Unifying interfaces:
RecursiveIterator
SeekableIterator
OuterIterator