Functions are used to perform a well defined task that is normally repeated at various places within a web site, web application, or other software application. The function sometimes needs certain information before performing its task, and sometimes returns a value to the calling page or program.

An example of how to use a simple function in PHP:

 function showMessage() {
echo "{$_SESSION["message"]}"; }

The above example shows a very simple function that displays the contents of a session variable called 'message'. The idea being that while a user is using a web site, etc, various messages are generated and stored in the 'message' session variable. Whenever the showMessage function is called, the contents of the session variable are displayed. So, for example, when the user logs on, you could display a message saying that they have done so. Likewise, when they log off, a different message could be displayed.

Calling a function

To call the showMessage function, you would just need to include the line:

showMessage()

in the web page (wrapped in php tags to distinguish it from normall HTML).

Passing values to a function

Often, a function requires one or more input values in order to perform its task. For example, take the following example that takes two numbers as input, and adds them together. The result is then returned to the calling web page or program.

function addNumbers($number1,$number2) {
$answer = $number1 + $number2;
return $answer; }

In the calling program we would have something similar to the following:

$number1 = "5";
$number2 = "6";
$sumOfNumbers = addNumbers($number1,$number2);
echo "$sumOfNumbers";

Obviously, in a real program you would not have the numbers hardcoded like this, but they would be obtained from user input or by some other means. Notice also that although the name of the returned variable is $answer, the calling program makes no reference to that. We could, if we wanted to, change the calling program to:

$answer = addNumbers($number1,$number2);
echo "$answer";

which might make things slightly easier to understand.

Millions of web designers and developers have chosen Adobe Dreamweaver as their software of choice for website creation. Even with the incredible amount of built-in functionality that comes standard with Dreamweaver, there are many web applications that require a vast amount of hand coding to implement. Web Developer Suite from WebAssist is a Dreamweaver extension bundle that helps eliminate hand coding and opens up a vast dynamic frontier for the average Dreamweaver user.

Web Developer Suite consists of the following individual WebAssist Dreamweaver extensions:

• DataAssist - for complete database administration
• SecurityAssist - for user management, login, cookies and sessions
• Digital File Pro - for mastering file upload and download
• Universal Email - for processing form email on your website
• Dynamic Dropdowns - for dynamic dropdown menu creation
• Cookies Toolkit - add server-side cookies with one click
• Pro Maps for Google - dynamic or static Google maps API integration
• Validation Toolkit - for validating any type of form information
• iRite - for integrating WYSIWYG text editors into websites
• Database Starter Kits - for both PHP and ASP

Each extension is installed individually within the Dreamweaver extension manager, and is accessed via the WebAssist toolbar added to Dreamweaver. The real value of the Web Developer Suite lies in the ability to code advanced website function in a fraction of the time it would take to hand code. Each extension operates from a wizard-like interface that clearly walks you through the steps needed to configure your task.

DataAssist creates complete database administration page sets with a few clicks of the mouse. Automatically generate web pages that add, delete, update, view or search your database. If you use Dreamweaver templates, DataAssist allows you to use your site template when generating pages. The resulting pages flow seamlessly into your website and are fully customizable via CSS.

SecurityAssist generates all the pages and code needed to create secure user registration and log in pages for your site. It teams up with Cookies Toolkit to utilize cookies and session variables to prevent unauthorized access to any pages you wish to restrict on your website.

If you need a Dreamweaver extension to control digital file upload and download, Digital File Pro is the extension of choice. Through a wizard-like interface, you can easily enable database file upload and download through your website. It's an excellent tool for webmasters who provide digital files such as MP3s, e-books, PDFs, images, photos, videos and any other type of downloadable file format.

Web Developer Suite also includes Universal Email, which is an extremely handy extension for emailing form input from your website. Universal Email even operates without a database, so it makes a great tool for emailing website contact form submissions. Emails can be formatted as text or HTML, and Universal Email includes a WYSIWYG HTML editor for creating your HTML email messages.

Pro Maps for Google inserts static or dynamic Google maps into your website. Addresses can be entered manually, from a file or even from your database recordset. The Google map API is fully configurable, with custom pointers, map controls and size. It's an excellent extension for inserting maps into dynamic websites.

Web Developer Suite also includes Validation Toolkit, which is WebAssist's form validation extension. Validate your form input client-side or server-side with a wide assortment of validation rules. By controlling form data input on your website, you can help reduce spam submissions and protect the integrity of your data.

The final Dreamweaver extension included in the Web Developer Suite is WebAssist's WYSIWYG form field text editor, iRite. Based on the popular FCKeditor, iRite allows you to insert a text editor in a Dreamweaver form for inputting valid XHTML code without needing any knowledge of HTML. iRite is a great extension for developing custom content management systems or just a simple way for clients to keep their own websites updated.

Web Developer Suite from WebAssist is an excellent addition to anyone's Dreamweaver toolbox. The cost of Web Developer Suite is a steal for the enormous amount of website function that is packaged in the bundle. Web designers can offer much greater website functionality to their clients and recoup the cost of the extensions in one project. There is no restriction on the number of sites you can build with Web Developer Suite, and no restrictive "per site" licensing. For web designers looking to push their websites to a new level, WebAssist Web Developer Suite is a must-have Dreamweaver add-on.

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