PHP and MySQL Web Development, Second Edition

PHP and MySQL Web Development, Second Edition

5.0 5
by Luke Welling, Laura Thomson, Laura Thomson
     
 

PHP and MySQL Web Development teaches the reader to develop dynamic, secure, commercial Web sites. Using the same accessible, popular teaching style of the first edition, this best-selling book has been updated to reflect the rapidly changing landscape of MySQL and PHP.

The book teaches the reader to integrate and implement these technologies by

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Overview

PHP and MySQL Web Development teaches the reader to develop dynamic, secure, commercial Web sites. Using the same accessible, popular teaching style of the first edition, this best-selling book has been updated to reflect the rapidly changing landscape of MySQL and PHP.

The book teaches the reader to integrate and implement these technologies by following real-world examples and working sample projects, and also covers related technologies needed to build a commercial Web site, such as SSL, shopping carts, and payment systems.

The second edition includes new coverage of how to work with XML in developing a PHP and MySQL site, and how to draw on the valuable resources of the PEAR repository of code and extensions.

Editorial Reviews

bn.com
The Barnes & Noble Review
Every once in awhile, it's nice to step back and marvel at how much you can accomplish without spending a dime on software. Take, for example, the combination of the PHP scripting language and the MySQL database: together, they can do virtually everything needed by the vast majority of dynamic, database-driven web sites. And, with the right kind of help, they're really not that hard to use.

Thousands of web developers have found exactly the help they needed in PHP and MySQL Web Development. Now, Luke Welling and Laura Thomson have updated their outstanding guide to reflect the latest versions of both MySQL (4.0) and PHP (4.2). They've also added new coverage of XML, as well as the new PEAR framework and distribution system for reusable PHP components -- a great resource for folks who'd rather not write all their code from scratch.

As in the first edition, this book is packed with practical sample code (all of it on the accompanying CD-ROM). The authors begin with a crash course on PHP itself: basic syntax, storing and retrieving data from simple flat file databases, using arrays; working with strings and regular expressions; functions; code reuse; and finally, object-oriented PHP techniques.

Next, you'll master MySQL: designing, creating, and working with databases for web applications plus using PHP to access MySQL databases. Welling and Thomson show how to use MySQL's privilege system to secure your databases more effectively, explaining the GRANT command first introduced in MySQL version 3.22.11; the mysql tables that store user and privilege information; and the new security issues that arise when you connect databases to the Web.

Next, they briefly introduce several practical techniques for optimizing your database's performance: minimizing redundancy through careful design; simplifying permissions; optimizing tables; and using indexes.

Once you have the grounding you need, the authors present detailed techniques for building real-world applications. There's an entire section on e-commerce, with detailed chapters on managing e-commerce sites and security, implementing authentication with PHP and MySQL, and, finally, securing transactions. And you'll find chapter-length coverage of networking, session control, interactions with filesystems and servers, managing dates and times, generating images, debugging, and other useful features.

The book also contains seven start-to-finish projects, ranging from content management to email, from generating on-the-fly PDFs to connecting with web services via SOAP.

These application case studies are wonderfully detailed, with clear explanations of the problems they're designed to solve, and simple diagrams explaining the program's system flow and how its modules fit together. What's more, they draw on a wide variety of PHP resources, demonstrating the breadth and depth of this language's capabilities -- and that of the community which surrounds it.

For example, using PHP's IMAP function library, you'll build a complete web-based email client that connects to an existing mail server. (They call their program Warm Mail, which should give you an idea of the model.) Warm Mail allows users to connect to their email accounts, read and send mail, forward and reply to messages, and delete mail -- in short, it's a pretty good workout of PHP's mail capabilities.

Then, in the following chapter, you'll implement a front-end for a mailing list manager customized for managing online newsletters. This app has a pretty long list of requirements: administrators should be able to set up and modify multiple mailing lists, then send text or HTML newsletters to each subscriber. Meanwhile, users should be able to register for the newsletter, enter and manage information about themselves, subscribe to multiple newsletters, unsubscribe to any of them, and view past newsletters. Plus, of course, all of this should be secure.

By the time you've developed this application, you ought to be able to write pretty much anything you need. Few books help you leverage this much power at this little cost. (Bill Camarda/Read Only)

Library Journal
These three guides cover the popular open-source programming language for creating dynamic web sites (see also Computer Media, LJ 3/1/02); libraries owning first editions should update. Essentials addresses topics from installing PHP to working with database systems. Advanced techniques cover working with images and XML, and appendixes include a language reference and recommended online resources. A useful and stripped-down introduction, appropriate for all libraries.Web Development, appropriate for larger libraries and intermediate programmers, focuses on the use of PHP with the equally popular MySQL. Part 1 explains using the language, while Part 2 adds extra value with thorough explanations of real-world projects such as user authentication, shopping carts, and online forums. Appendixes cover installing PHP, Apache, and MySQL under both UNIX and Windows and recommended resources; the CD contains source code, software, and the entire title in PDF format. A good crash course in building dynamic web sites with the two technologies; buy in conjunction with more basic guides. Core relates to intermediate to advanced programmers, tackling the new features and useful functions of the yet-to-be-released PHP v.5. Sample code is provided; the authors ask readers to extend functionality on their own. Appendixes include escape sequences, ASCII codes, operators, tags, configuration, online resources, and a style guide. For libraries serving large programming communities. Copyright 2003 Reed Business Information.
Booknews
Shows how to combine the PHP scripting language with the MySQL database to produce interactive web sites. The guide provides examples that demonstrate tasks such as authenticating users, constructing a shopping cart, generating PDF documents and images dynamically, sending and managing email, facilitating user discussions, and managing content. Significant attention is paid to the importance of security. The CD-ROM contains PHP 4, MySQL, and Apache source code and binaries. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Slashdot.org
I like this book a great deal. Even after a fair amount of time with the previous edition I still find it useful ... Welling and Thomson have updated extensively and improved slightly a book that may well be the classic text on the topic.

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Product Details

ISBN-13:
9780672325250
Publisher:
Sams
Publication date:
02/13/2003
Series:
Developer's Library
Edition description:
Older Edition
Pages:
871
Product dimensions:
7.06(w) x 9.18(h) x 2.05(d)

Read an Excerpt

Chapter 3: Using Arrays

This chapter shows you how to use an important programming construct—arrays. The variables that we looked at in the previous chapters are scalar variables, which store a single value. An array is a variable that stores a set or sequence of values. One array can have many elements. Each element can hold a single value, such as text or numbers, or another array. An array containing other arrays is known as a multidimensional array.

PHP supports both numerically indexed and associative arrays. You will probably be familiar with numerically indexed arrays if you've used a programming language, but unless you use PHP or Perl, you might not have seen associative arrays before. Associative arrays let you use more useful values as the index. Rather than each element having a numeric index, they can have words or other meaningful information.

We will continue developing the Bob's Auto parts example using arrays to work more easily with repetitive information such as customer orders. Likewise, we will write shorter, tidier code to do some of the things we did with files in the previous chapter.

Key topics covered in this chapter include

  • What is an array?

  • Numerically indexed arrays

  • Associative arrays

  • Multidimensional arrays

  • Sorting arrays

  • Further reading

What Is an Array?

We looked at scalar variables in Chapter 1, "PHP Crash Course." A scalar variable is a named location in which to store a value; similarly, an array is a named place to store a set of values, thereby allowing you to group common scalars.

Bob's product list will be the array for our example. In Figure 3.1, you can see a list of three products stored in an array format and one variable, called $products, which stores the three values. (We'll look at how to create a variable like this in a minute.)

Figure 3.1
Bob's products can be stored in an array.

After we have the information as an array, we can do a number of useful things with it. Using the looping constructs from Chapter 1, we can save work by performing the same actions on each value in the array. The whole set of information can be moved around as a single unit. This way, with a single line of code, all the values can be passed to a function. For example, we might want to sort the products alphabetically. To achieve this, we could pass the entire array to PHP's sort() function.

The values stored in an array are called the array elements. Each array element has an associated index (also called a key) that is used to access the element.

Arrays in most programming languages have numerical indexes that typically start from zero or one. PHP supports this type of array.

PHP also supports associative arrays, which will be familiar to Perl programmers. Associative arrays can have almost anything as the array indices, but typically use strings.

We will begin by looking at numerically indexed arrays.

Numerically Indexed Arrays

These arrays are supported in most programming languages. In PHP, the indices start at zero by default, although you can alter this.

Initializing Numerically Indexed Arrays

To create the array shown in Figure 3.1, use the following line of PHP code:

$products = array( "Tires", "Oil", "Spark Plugs" );

This will create an array called products containing the three values given—"Tires", "Oil", and "Spark Plugs". Note that, like echo, array() is actually a language construct rather than a function.

Depending on the contents you need in your array, you might not need to manually initialize them as in the preceding example.

If you have the data you need in another array, you can simply copy one array to another using the = operator.

If you want an ascending sequence of numbers stored in an array, you can use the range() function to automatically create the array for you. The following line of code will create an array called numbers with elements ranging from 1 to 10:

$numbers = range(1,10);

If you have the information stored in file on disk, you can load the array contents directly from the file. We'll look at this later in this chapter under the heading "Loading Arrays from Files."

If you have the data for your array stored in a database, you can load the array contents directly from the database. This is covered in Chapter 10, "Accessing Your MySQL Database from the Web with PHP."

You can also use various functions to extract part of an array or to reorder an array. We'll look at some of these functions later in this chapter, under the heading "Other Array Manipulations."

Accessing Array Contents

To access the contents of a variable, use its name. If the variable is an array, access the contents using the variable name and a key or index. The key or index indicates which stored values we access. The index is placed in square brackets after the name.

Type $products[0], $products[1], and $products[2] to use the contents of the products array.

Element zero is the first element in the array. This is the same numbering scheme as used in C, C++, Java, and a number of other languages, but it might take some getting used to if you are not familiar with it.

As with other variables, array elements contents are changed by using the = operator. The following line will replace the first element in the array "Tires" with "Fuses".

$products[0] = "Fuses";

The following line could be used to add a new element—"Fuse"—to the end of the array, giving us a total of four elements:

$products[3] = "Fuses";

To display the contents, we could type

echo "$products[0] $products[1] $products[2] $products[3]";

Like other PHP variables, arrays do not need to be initialized or created in advance. They are automatically created the first time you use them.

The following code will create the same $products array:

$products[0] = "Tires";
$products[1] = "Oil";
$products[2] = "Spark Plugs";

If $products does not already exist, the first line will create a new array with just one element. The subsequent lines add values to the array.

Using Loops to Access the Array

Because the array is indexed by a sequence of numbers, we can use a for loop to more easily display the contents:

for ( $i = 0; $i<3; $i++ )
 echo "$products[$i] ";

This loop will give similar output to the preceding code, but will require less typing than manually writing code to work with each element in a large array. The ability to use a simple loop to access each element is a nice feature of numerically indexed arrays. Associative arrays are not quite so easy to loop through, but do allow indexes to be meaningful.

Associative Arrays

In the products array, we allowed PHP to give each item the default index. This meant that the first item we added became item 0, the second item 1, and so on. PHP also supports associative arrays. In an associative array, we can associate any key or index we want with each value.

Initializing an Associative Array

The following code creates an associative array with product names as keys and prices as values.

$prices = array( "Tires"=>100, "Oil"=>10, "Spark Plugs"=>4 );

Accessing the Array Elements

Again, we access the contents using the variable name and a key, so we can access the information we have stored in the prices array as $prices[ "Tires" ], $prices[ "Oil" ], and $prices[ "Spark Plugs" ].

Like numerically indexed arrays, associative arrays can be created and initialized one element at a time.

The following code will create the same $prices array. Rather than creating an array with three elements, this version creates an array with only one element, and then adds two more.

$prices = array( "Tires"=>100 );
$prices["Oil"] = 10;
$prices["Spark Plugs"] = 4;

Here is another slightly different, but equivalent piece of code. In this version, we do not explicitly create an array at all. The array is created for us when we add the first element to it.

$prices["Tires"] = 100;
$prices["Oil"] = 10;
$prices["Spark Plugs"] = 4;

Using Loops with each() and list()

Because the indices in this associative array are not numbers, we cannot use a simple counter in a for loop to work with the array. The following code lists the contents of our $prices array:

while( $element = each( $prices ) )
{
 echo $element[ "key" ];
 echo " - ";
 echo $element[ "value" ];
 echo "<br>";
}

The output of this script fragment is shown in Figure 3.2.

Figure 3.2
An each statement can be used to loop through arrays.

In Chapter 1, we looked at while loops and the echo statement. The preceding code uses the each() function, which we have not used before. This function returns the current element in an array and makes the next element the current one. Because we are calling each() within a while loop, it returns every element in the array in turn and stops when the end of the array is reached.

In this code, the variable $element is an array. When we call each(), it gives us an array with four values and the four indexes to the array locations. The locations key and 0 contain the key of the current element, and the locations value and 1 contain the value of the current element. Although it makes no difference which you choose, we have chosen to use the named locations, rather than the numbered ones.

There is a more elegant and more common way of doing the same thing. The function list() can be used to split an array into a number of values. We can separate two of the values that the each() function gives us like this...

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Meet the Author

Luke Welling and Laura Thomson are co-founders of Tangled Web Design and recently won the CCH Emerging Technology award for a site they built using PHP. Both are teachers at RMIT University in Melbourne, Australia, and have over five years of web design experience.

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