1Introduction to PHP 5 Presented by Brett Buddin.

1 Introduction to PHP 5

Introduction to PHP 5

Presented by Brett Buddin

2 Introduction to PHP 5

What is PHP?

“PHP: Hypertext Preprocessor”• General purpose scripting language

• Most commonly used for server-side scripting

3 Introduction to PHP 5

4 Introduction to PHP 5

Why use PHP?

• Simple syntax

• Easy to learn

• Great performance

• Fantastic online documentation

• Open Source

5 Introduction 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

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History

• PHP 4 released in May 2000

• PHP 5 released in July 2004

• Today powers millions of applications

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Growth of PHP

Source: Netcraft

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New in PHP 5

• Completely rewritten object model

• Interoperable XML tools

• MySQLi extension

• SQLite embedded

• Exception handling

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Objects in PHP 3 and 4

• Treated as primitive data types

• Assigned and passed by value

• Had to manually force pass by reference

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Objects in PHP 5

• Woven into the core

• Assigned and passed by handle

• This eliminates a lot of ampersands

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Rewritten object model

• Interfaces and Abstract classes

• Class type hints

• Static keyword

• Final keyword

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Rewritten object model

• Cloning

• Constructors and destructors

• Access modifiers

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Cloning

• __clone() method

• Offers a way to create a copy of an object

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Constructors and Destructors

• __construct() and __destruct() methods added

• Old constructor syntax still works

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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

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Interoperable XML tools

• Standardized on libxml2• Extensions work together as a whole

• W3C specification compliant

• Very efficient

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MySQLi Extension

• Prepared statements

• Bound input and output parameters

• SSL connections

• Multi-query functions

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SQLite embedded

• No need for flat file databases

• SQLite supports– Transactions

– Subqueries

– Triggers

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Exception handling

• Eliminates the need to check return values for every function

• Separation of business logic and error logic

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PHP’s drawbacks

• Lack of language design

• Inconsistent naming conventions and function behavior

• Almost too popular

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Questions?