Reusing pieces of HTML code is a common way of making web sites (or web applications) more consistent, reliable, and more manageable. Even a small web site consisting of perhaps 20 or 30 web pages can benefit from reusing code for header and footer sections, for example. If the same header or footer is used across all the pages on the site, it makes sense to put the header and footer code in separate files, and then call those files to insert their contents where required.

PHP offers two statements that can be used for inserted the contents of one file inside another: include() and require(). These two statements are virtually identical, with the only real difference being that if require() fails, it gives a fatal error, whereas if include() fails it just gives a warning. For this reason I tend to use the include() statement as it just seems slightly more friendly.

So, to include the contents of a file called header.inc inside a web page called index.php, you would just need to insert the following line of code (wrapped in PHP opening and closing tags) inside index.php.

Include 'header.inc';

As PHP takes no notice of the extension used for the included file, you can use whatever extension you want to. Be careful though, if you put passwords inside an include file with a .inc extension, they will be visible. You can get around this by putting include files that contain sensitive information outside the document tree to prevent people from browsing to them.

In Part 2 we'll look at the use of functions when developing web sites and applications.

Here are essential things that you have to understand in web development.

1. Web appearance and Usability

Most newcomers often think that appearance of web site is the measurement of how it will fare in terms of traffic and visitors visiting the site but this premise is not totally true.

Yes, appearance is really important in web design but it is not the sole measurement of success of a site. Of course it will not be good to see if the site is shabby and not maintained properly but aside from appearance, you have to consider the usability of each content and links that you have posted there.

If example you posted large beautiful image but it is unrelated to content of your site, do you think your reader will appreciate that? No, viewers will likely appreciate a relatively small image related to your content than an image that is totally unrelated no matter how pretty it is.

Usability is a key in web design. Do not just put pretty but totally unnecessary images. All images and links should be useful to your site.

If you are building a portfolio, post only related sample projects that you have previously work and you don't have to mention the projects that you did not accept.

If you want use the site to sell products, it will be better if you describe them in brief and concise way and avoid unnecessary description.

2. Purpose

What is the purpose of your web site? Do you want to earn additional income? Do you want to use the site to display your portfolio? Or do you want to sell and trade goods?

Purpose will likely to give you the design that you need. If you are a member of affiliate marketing, then you have to post marketing ads to your site to generate income through pay-per-click method.

If you are designing a web site to use it as your portfolio, then you have to post there your resume and sample projects that you have done in the past.

If you would like to sell or trade goods, then you can have to post all your products, pricelist and payment options in the web site.

3. Information

Information enriched websites are the ones who always get new visitors everyday. There are many web sites being launched in the Internet everyday but not all these web sites will offer new and updated information everyday or every week. Most of these web sites will likely to offer the same articles and tidbits for the rest of the year.

If you don't update your site often, your visitors will likely to loose interest in visiting your site, as there will be another site to offer new and more exciting articles and contents.

Competition is hard in web sites that is why you have to keep it updated to current new trends and new information to make them return to your site.

You can consider weekly newsletter as part of your web design. This is one way to keep your site interesting and informative to readers.

You know when it comes to doing anything in life its all about implementation. Sure at this juncture you may be overwhelmed and a little confused about what to do. You may have lots of ideas but you just do not know where to start.

As a result you do not implement anything you just get confused and overwhelmed and then nothing happens. The first thing you need to do is identify your strengths. This is where you are going to begin.

When it comes to building a website you know that its core value is based upon the information it provides. Secondly that information needs to be organized logically. Then that information needs to make sense to your readers and also needs to be understood by the search engines.

So having good site structure will benefit all parties concerned. At this point you probably have something in mind about what you want to do online - in other words a subject that you want to build your site around.

If not you have some reason for wanting to build a site in the first place and that may be just to share it with friends and family or to make money.

Identify your ideas and write them down. Once you have cleared your mind then you will be in a far better position to move onto the next task.

The main thing is to understand the main structure of the internet and that is to provide information which can be delivered through multiple mediums such as video, audio, or straight content.

Then just make sure that you can deliver this effectively and you will have a solid foundation to build on.