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.

If you are considering building a web site for your business, then you will more than likely like it to rank in the search engines There are many factors that influence website rankings and many of these factors can be implemented while you are creating your website. Optimizing your website properly for your business will ensure a more successful site.

Have you heard the concept "Content is King"? The search engines are becoming more selective at who ranks highly and want to provide the best content for each search term. They are looking for high quality content that is continually updated and provides a quality experience for their searchers. It makes no difference whether you have a content site or a physical product site. Content is "King" as far as the search engines are concerned. By providing quality content and/or good descriptive descriptions of products you sell you will be helping your customers and you may just help yourself at ranking.

One mistake many new webmasters make is to over optimize their web page by using too many keywords. If you are excessive with your keywords, your web page will not read well and the search engines my penalize you. It is considered spamming when your techniques are questionable even if that wasn't your intention. There are other techniques that are considered unethical including hiding text, and redirects. Just write for your visitor and don't try to over optimize your web page.

Another thing to keep in mind that may cause you problems is the use of frames. Make sure you know how to use frames correctly before using them on your website. If the proper frame context is established, then the search engines can send visitors to your site. However if you use frames incorrectly the spiders for them will not be able to crawl your web page and or website.

During web site building, you should also consider the depth of your site. Search engines have spiders that crawl through the web pages and find the necessary keywords. If you do not setup the correct linking structure throughout your website the spiders may not be able to crawl your entire site. One of the best practices when setting up your websites' structure is to include a sitemap that lists all the web pages that make up your website and then link your sitemap to your homepage. This will help ensure that the search engines can crawl your site.

With proper planning and a little research you will be able to build a professional site that the search engines love.

Before you actually begin your website you have to put a lot of consideration into things such as the domain name itself and the hosting company you sign up with. These decisions can have a major affect on the end result so ensure you do your research to get the best outcome.

Once you have found the desired domain name you have to get it registered, there are a number of companies that offer the registration of domains so how do you decide which to use? The first thing you should look for is their reputation, you would hate to deal with a dishonest company that doesn't offer the customer service you deserve. In order to find a reliable company you can ask for recommendations from friends and family or other webmasters to see who they use. The next factor you should look at is the price, don't be fooled for the cheapest companies out there. Just because they can offer a cheap service doesn't mean that it's the best choice, check for renewal prices and any other disadvantages you may be faced with so that you can be confident you are receiving the best deal.

When you have your domain name the next step is to choose hosting, you cannot afford to rush this decision as it will determine the results of your website. Put the time and effort in to check which hosts are reliable and offer great customer service. Never accept anything below 99.99% up time as you will be loosing money every time your website goes down. You then have to spend the time in order to get it back up and running as intended, loosing even more money. Browse through each of the different hosting companies, checking the additional features, benefits and mainly the price in order to get the best deal based on your requirements.

You can find various companies such as name cheap, triple and go daddy who can be the solution to all your problems. You can register your domains with them and buy hosting at the same time, this takes a lot of the hassle out of the equation as everything is in the one place. There are some advantages to doing this, you can often get a reduced price if you buy them both together. It will give you more time to focusing on your website and if you ever have a problem you only have to contact the one company. Ensure that you check out the hosting package before you buy it to make sure that it has the features you require.

With the benefits it does have it's disadvantages, depending on the company the hosting may not be the best option out there and you can often get various coupon codes to make things cheaper and by shopping around you can always save a great deal of money.