1Introduction to PHP 5 Presented by Brett Buddin

2Introduction to PHP 5 What is PHP? “PHP: Hypertext Preprocessor” General purpose scripting language Most commonly used for server-side scripting

3Introduction to PHP 5

4 Why use PHP? Simple syntax Easy to learn Great performance Fantastic online documentation Open Source

5Introduction to PHP 5 History Initially released in June 1995 by Rasmus Lerdorf as “Personal Home Page Tools” Lerdorf merged PHP with his Form Interpreter to create PHP/FI Zeev Suraski and Andi Gutmans rewrote the parser to form the core of PHP 3

6Introduction to PHP 5 History PHP 4 released in May 2000 PHP 5 released in July 2004 Today powers millions of applications

7Introduction to PHP 5 Growth of PHP Source: Netcraft

8Introduction to PHP 5 New in PHP 5 Completely rewritten object model Interoperable XML tools MySQLi extension SQLite embedded Exception handling

9Introduction to PHP 5 Objects in PHP 3 and 4 Treated as primitive data types Assigned and passed by value Had to manually force pass by reference

10Introduction to PHP 5 Objects in PHP 5 Woven into the core Assigned and passed by handle This eliminates a lot of ampersands

11Introduction to PHP 5 Rewritten object model Interfaces and Abstract classes Class type hints Static keyword Final keyword

12Introduction to PHP 5 Rewritten object model Cloning Constructors and destructors Access modifiers

13Introduction to PHP 5 Cloning __clone() method Offers a way to create a copy of an object

14Introduction to PHP 5 Constructors and Destructors __construct() and __destruct() methods added Old constructor syntax still works

15Introduction to PHP 5 Access modifiers Access modifiers added for properties and methods The three P’s: –Public: All scopes have access –Private: Only local object has access –Protected: Only local and derived objects have access

16Introduction to PHP 5 Interoperable XML tools Standardized on libxml2 Extensions work together as a whole W3C specification compliant Very efficient

17Introduction to PHP 5 MySQLi Extension Prepared statements Bound input and output parameters SSL connections Multi-query functions

18Introduction to PHP 5 SQLite embedded No need for flat file databases SQLite supports –Transactions –Subqueries –Triggers

19Introduction to PHP 5 Exception handling Eliminates the need to check return values for every function Separation of business logic and error logic

20Introduction to PHP 5 PHP’s drawbacks Lack of language design Inconsistent naming conventions and function behavior Almost too popular

21Introduction to PHP 5 Questions?