A normal procedure with banner adverts is to rotate them randomly, but also to display some more than others. Lets say that you had 3 banner adds and that you wanted to display them at different rates. To do this you can use the rand() function to generate a random number that can then be used to see what banner advert will be displayed.
First we generate the random number, in our case it is between 1 and 100.
You will sometimes want to make sure that your code is a better hidden from the end user. For example, you might want to make sure that your database password files are completely hidden from prying eyes so that even if your web server is hacked your database server isn't also compromised.
Take the following code, which prints out "Hello world".
echo "Hello world";You can encode this into meaningless text by using the base64_encode() function.
$code = base64_encode('echo "Hello world";');This turns the $code variable into the following.
Firebug is by far the best JavaScript debugging plug-in available for Firefox. I have been stuck on a few problems in the past and Firebug has usually provided me with a reason as to why things are going wrong. In fact when developing for other browsers (like Internet Explorer) I can feel a little blind as there are no debugging tools with the power and features of Firebug. It can allow you to stop JavaScript execution at any time using breakpoints.
Firebug is important if you are creating AJAX applications as it will tell you about every client/server communication, what headers where sent and what the response was.
Using timestamps is quite a common practice, but converting them into "real life" times can be a little hard. So here are some common time intervals that you might need.
Hypertext access, or .htaccess files, allow you to change the Apache configuration on a by directory basis. However, you should always use the main server configuration file to do configuration changes whenever possible. This is because when Apache is configured to process .htaccess files it looks at every directory underneath the current directory to see if there are any files present, resulting in a slightly longer page load time. Although this might not be noticeable with low traffic levels, at high traffic levels it can cause sites to slow down. You should therefore use .htaccess files only when the main server configuration file (http.conf) is inaccessible.
To increase performance you can use the AllowOverride directive in your top level directory, or any directory who's subdirectories do not use .htaccess files. This will stop Apache from searching through all sub directories.
Since starting programming I have used a lot of text editors, some have been good, and some have been very, very bad.
One text editor that stands out is PSPad. It is a free text editor for Windows that has lots of features and is very stable. I have been using this for a while now and have seen very little problems. I say "very little" as I once tried to open a 800 megabyte log file and it fell over, which is understandable.
It has the following features:
Use the following bit of code to create a web safe colour table. In order to for the name of each colour to be displayed the background colour array is reversed and used to create the foreground colours. This makes white text appear on black backgrounds and visa-versa, the only problem is that in the middle of the table it will display grey on grey.
Hiding your email address in an image is the best way of encrypting your email, but if your server doesn't support the GD2 library, or if you don't want to use it, then you might want to look at a different way of doing this.
The easiest way to encrypt your email address is to turn every character into the ASCII code equivalent and use this to display the text in HTML by putting a in front of each character. Here is a function that takes a string and turns it into HTML encoded text.
Wordpress is a very impressive blogging platform written in PHP and JavaScript. Impressive in terms of features, ease of use and stability. Wordpress comes with two default templates and two examples plugins, but you can very easily create your own templates and plugins with the Wordpress API.
Looking at the code behind Wordpress there are several classes that it uses to accomplish certain things. For example, Wordpress uses the IXR class from Incutio as a XML-RPC server/client. Doing this saves the Wordpress developers from re-writing things that other people have written so that they can concentrate on the important things.
The reverse of turning ASCII text into HTML is to convert HTML into ASCII. And to this end here is a little function that does this.