SPL Primer

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SPL

2
Who am I?
• Lorna Jane Mitchell
• PHP consultant, trainer, and writer
• Personal site at lornajane.net
• Twitter: @lorna...

3
SPL
• Standard PHP Library
• An extension to do common things
• FAST! Because it's in C
• Lots of functionality (tonight...

4
The SPL Drinking Game
• When anyone says "iterator", take a drink
http://www.flickr.com/photos/petereed/2667835909/

5
Before We Go …
• SPL relies heavily on OOP theory and
interfaces
• Let's recap on some theory

6
OOP

7
Classes vs Objects
• If the class is the recipe …
• Then the object is
the cake
1 <?php
2
3 class CupCake
4 {
5 public f...

8
Inheritance
• Using classes as "big-picture templates"
and changing details
• Parent has shared code
• Child contains di...

9
Example: Cake Class
1 <?php
2
3 class Cake
4 {
5 public function getIngredients() {
6 return array("2 eggs", "margarine"...

10
Example: CupCake Class
1 <?php
2
3 class CupCake
4 {
5 public function addFrosting($colour, $height)
{
6 // ...
7 }
8 }...

11
Interfaces
• Define a contract
• Classes implement interfaces - they must
fulfil the contract
• Interfaces define a sta...

12
Interface Example
1 <?php
2
3
4 interface Audible {
5 function speak();
6 }
7
8 class Sheep implements Audible {
9 func...

13
Object Comparison
• Check object types
– type hinting
– instanceOf operator
• Evaluate as true if object either:
– is o...

14
SPL Interfaces

15
SPL Interfaces
• Countable
• ArrayAccess
• Iterator

16
Countable
• We can dictate what happens when we
count($object)
• Class implements Countable
• Class must now include a ...

17
Countable Example
1 <?php
2
3 class Basket implements Countable
4 {
5 public $items = array();
6
7 public function addI...

18
ArrayAccess
• Define object's array behaviour
• Allows us to use array notation with an
object in a special way
• A goo...

19
ArrayAccess
1 <?xml version="1.0" ?>
2 <foodStore>
3 <fridge>
4 <eggs />
5 <milk expiry="2010-11-07" />
6 </fridge>
7 <...

20
Iterators
• Dictate how we traverse an object when
looping
• Defines 5 methods:
1 <?php
2
3 interface Iterator
4 {
5 pu...

21
More Iterators
• DirectoryIterator
• LimitIterator
• SimpleXMLIterator
• CachingIterator
• ...
• RecursiveIteratorItera...

22
Using SPL

23
Using SPL
• SPL builds on these ideas to give us great
things
• Datastructures
• Filesystem handling
• SPLException

24
Datastructures

25
SPLFixedArray
• An object that behaves like an array
• Fixed length
• Integer keys only
• FAST!!

26
SPLDoublyLinkedList
• Simple and useful computer science
concept
• Ready-to-use implementation
• Can push, pop, iterate...

27
SPLStack, SPLQueue
• Built on the SPLDoublyLinkedList
• No need to home-spin these solutions in
PHP
• Simply extend the...

28
SPLQueue Example
1 <?php
2
3 class LornaList extends SPLQueue
4 {
5 public function putOnList($item) {
6 $this->enqueue...

Filesystem Handling

30
Filesystem Handling
• SPLFileInfo - everything you ever needed
to know about a file
• DirectoryIterator - very neat way...

31
Filesystem Example
• taken directly from devzone
– http://devzone.zend.com/article/2565-The-Standard-PHP-Library-SPL
1 ...

32
Exceptions

33
SPLException
• Many additional exception types
• Allows us to throw (and catch) specific
exceptions
• Including:
– BadM...

34
SPL Exception Example
1 <?php
2
3 class LornaList extends SPLQueue
4 {
5 public function putOnList($item) {
6 if($this-...

35
SPL

36
SPL
• Interfaces
• Datastructures
• File handling
• Exceptions
• … and so much more

37
Questions?

38
Resources
• PHP Manual
http://uk2.php.net/manual/en/book.spl.php
• DevZone Tutorial
http://devzone.zend.com/article/256...

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