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PHP Object-Oriented Solutions

Name: PHP Object-Oriented Solutions
Author: David Powers
ISBN: 9781430210115

by David Powers

August 2008

Beginner to intermediate

395 pages

9h 12m

English

Apress

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Copyright
ABOUT THE AUTHOR
ABOUT THE TECHNICAL REVIEWER
ACKNOWLEDGMENTS
INTRODUCTION
1. WHY OBJECT-ORIENTED PHP?
1.1. Understanding basic OOP concepts1.1.1. How OOP evolved1.1.2. Using classes and objects1.1.3. Protecting data integrity with encapsulation1.1.4. Polymorphism is the name of the game1.1.5. Extending classes through inheritance1.1.5.1. Deciding on a class hierarchy1.1.6. Using best practice1.2. How OOP has evolved in PHP1.2.1. OOP since PHP 51.2.2. Preparing for PHP 61.3. Choosing the right tools to work with PHP classes1.3.1. Using a specialized script editor1.4. Chapter review
2. WRITING PHP CLASSES
2.1. Formatting code for readability2.1.1. Using the Zend Framework PHP Coding Standard2.1.2. Choosing descriptive names for clarity2.2. Creating classes and objects2.2.1. Defining a class2.2.2. Controlling access to properties and methods2.2.2.1. Quick review2.2.3. Setting default values with a constructor method2.3. Using inheritance to extend a class2.3.1. Defining a child class2.3.2. Accessing a parent class's methods and properties2.3.2.1. Using the scope resolution operator2.3.3. Controlling changes to methods and properties2.3.3.1. Preventing a class or method from being overridden2.3.3.2. Using class constants for properties2.3.3.3. Creating static properties and methods2.3.3.4. Quick review2.4. Loading classes automatically2.5. Exploring advanced OOP features2.5.1. Creating abstract classes and methods2.5.2. Simulating multiple inheritance with interfaces2.5.3. Understanding which class an object is an instance of2.5.3.1. Restricting acceptable data with type hinting2.6. Using magic methods2.6.1. Converting an object to a string2.6.2. Cloning an object2.6.3. Accessing properties automatically2.6.4. Accessing methods automatically2.6.5. Cleaning up with a destructor method2.7. Handling errors with exceptions2.7.1. Throwing an exception2.7.2. Catching an exception2.7.3. Extracting information from an exception2.7.4. Extending the Exception class2.8. Using comments to generate code hints2.8.1. Writing PHPDoc comments2.9. Chapter review
3. TAKING THE PAIN OUT OF WORKING WITH DATES
3.1. Designing the class3.1.1. Examining the built-in date-related classes3.1.1.1. Using the DateTime class3.1.1.2. Setting the default time zone in PHP3.1.1.3. Examining the DateTimeZone class3.1.1.4. Using the DateTimeZone class3.1.2. Deciding how to extend the existing classes3.2. Building the class3.2.1. Creating the class file and constructor3.2.2. Resetting the time and date3.2.3. Accepting dates in common formats3.2.3.1. Accepting a date in MM/DD/YYYY format3.2.3.2. Accepting a date in DD/MM/YYYY format3.2.3.3. Accepting a date in MySQL format3.2.4. Outputting dates in common formats3.2.5. Outputting date parts3.2.6. Performing date-related calculations3.2.6.1. Adding and subtracting days or weeks3.2.6.2. Adding months3.2.6.3. Subtracting months3.2.6.4. Adding and subtracting years3.2.6.5. Calculating the number of days between two dates3.2.7. Creating a default date format3.3. Creating read-only properties3.4. Organizing and commenting the class file3.5. Chapter review
4. USING PHP FILTERS TO VALIDATE USER INPUT
4.1. Validating input with the filter functions4.1.1. Understanding how the filter functions work4.1.1.1. filter_has_var()4.1.1.2. filter_list()4.1.1.3. filter_id()4.1.2. Setting filter options4.1.2.1. Filtering single variables4.1.2.2. Setting flags and options when filtering a single variable4.1.2.3. Filtering multiple variables4.1.3. Setting a default filter4.2. Building the validation class4.2.1. Deciding what the class will do4.2.2. Planning how the class will work4.2.3. Coding the validation class properties and methods4.2.3.1. Naming properties and defining the constructor4.2.3.2. Setting the input type and checking required fields4.2.3.3. Preventing duplicate filters from being applied to a field4.2.3.4. Creating the validation methods4.2.3.5. Creating the methods to process the tests and get the results4.3. Using the validation class4.4. Sticking to your design decisions4.5. Chapter review
5. BUILDING A VERSATILE REMOTE FILE CONNECTOR
5.1. Designing the class5.2. Building the class5.2.1. Defining the constructor5.2.2. Checking the URL5.2.3. Retrieving the remote file5.2.3.1. Defining the accessDirect() method5.2.3.2. Using cURL to retrieve the remote file5.2.3.3. Using a socket connection to retrieve the remote file5.2.3.4. Handling the response headers from a socket connection5.2.3.5. Generating error messages based on the status code5.2.4. Final testing5.2.5. Ideas for improving the class5.3. Chapter review

6. SIMPLEXML—COULDN'T BE SIMPLER
6.1. A quick XML primer6.1.1. What is XML?6.1.2. How XML documents are structured6.1.3. The rules of writing XML6.1.3.1. Using HTML entities in XML6.1.3.2. Inserting HTML and other code in XML6.2. Using SimpleXML6.2.1. Loading an XML document with SimpleXML6.2.1.1. Loading XML from a file6.2.1.2. Loading XML from a string6.2.2. Extracting data with SimpleXML6.2.2.1. Accessing text nodes6.2.2.2. Accessing attributes6.2.2.3. Accessing unknown nodes6.3. Saving and modifying XML with SimpleXML6.3.1. Outputting and saving SimpleXMLElement objects6.3.2. Modifying SimpleXMLElement objects6.3.2.1. Changing the values of text and attributes6.3.2.2. Removing nodes and values6.3.2.3. Adding attributes6.3.2.4. Adding new elements6.4. Using SimpleXML with namespaces6.4.1. How namespaces are used in XML6.4.2. Handling namespace prefixes in SimpleXML6.4.2.1. Handling namespaced attributes6.4.3. Finding out which namespaces a document uses6.5. Using SimpleXML with XPath6.5.1. A quick introduction to XPath6.5.2. Using XPath to drill down into XML6.5.2.1. Using XPath expressions for finer control6.5.3. Using XPath with namespaces6.5.3.1. Registering namespaces to work with XPath6.6. Chapter review
7. SUPERCHARGED LOOPING WITH SPL
7.1. Introducing iterators7.1.1. Using an array with SPL iterators7.1.2. Limiting the number of loops with the LimitIterator7.1.3. Using SimpleXML with an iterator7.1.4. Filtering a loop with a regular expression7.1.4.1. Setting options for RegexIterator7.1.5. Looping sequentially through more than one set of data7.1.6. Looking ahead with the CachingIterator7.1.7. Using anonymous iterators as shorthand7.2. Examining files and directories7.2.1. Using DirectoryIterator7.2.2. Including subdirectories in a single operation7.2.3. Extracting file information with SplFileInfo7.2.3.1. Finding files of a particular type7.2.4. Reading and writing files with SplFileObject7.3. Extending iterators7.3.1. Understanding the Iterator interface7.3.2. Extending the FilterIterator class7.4. Chapter review
8. GENERATING XML FROM A DATABASE
8.1. Designing the application8.1.1. Defining the application's purpose8.1.2. Setting the requirements8.2. Building the application8.2.1. Creating the database connection8.2.2. Getting the database result8.2.2.1. Defining the properties and constructor8.2.2.2. Implementing the Iterator interface8.2.2.3. Implementing the Countable interface8.2.3. Generating the XML output8.2.3.1. Defining the properties and constructor8.2.3.2. Setting the SQL query8.2.3.3. Setting the root and top-level node names8.2.3.4. Obtaining the primary key8.2.3.5. Setting output file options8.2.3.6. Using XMLWriter to generate the output8.3. Chapter review
9. CASE STUDY: CREATING YOUR OWN RSS FEED
9.1. Understanding the RSS 2.0 format9.1.1. The structure of an RSS 2.0 feed9.1.1.1. What the <channel> element contains9.1.1.2. What the <item> elements contain9.1.2. Deciding what the feed will contain9.2. Building the class9.2.1. Populating the elements that describe the feed9.2.2. Populating the <item> elements9.2.2.1. Building the SQL query9.2.2.2. Creating the <pubDate> element9.2.2.3. Creating the <link> elements9.2.2.4. Creating helper methods to format <item> child elements9.2.2.5. Generating the XML for the <item> elements9.3. Where to go from here

Content preview from PHP Object-Oriented Solutions

Chapter 6. SIMPLEXML—COULDN'T BE SIMPLER

The main reason I migrated to PHP 5 within a month or two of its original release in July 2004 can be summed up in one word: SimpleXML. As the name suggests, it simplifies handling data stored in XML, which is frequently used for news feeds and transmitting data for web services, such as Google Maps and Amazon Web Services. Extracting data from an XML file in PHP 4 was so convoluted; my brain hurt just looking at the code. With SimpleXML, it became child's play.

In this chapter, you'll learn about:

What XML is and what it's used for
Extracting data from an XML document with SimpleXML
How to modify the contents ...

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PHP Object-Oriented Solutions

by David Powers

Chapter 6. SIMPLEXML—COULDN'T BE SIMPLER

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