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PHP is one of the most popular programming languages used in a web environment. The language s most important advantage is that you can integrate it smoothly into an HTML page. Also, PHP works together easily with MySQL to get and put data in a database. The only thing you have to do as an administrator to integrate PHP in your Apache web server is call the mod_php5 Apache module. To confirm that PHP is properly installed on your server, write a simple script that includes the following line: < php phpinfo(); > Write this text to a file with the name test.php and put the file in the document root of your web server. Next, open a web browser to http://yourserver/test.php. This should display a window with information about the current status of your PHP installation. Make sure that PHP is installed and responds properly to this page, as many current web pages include PHP code. Installing PHP is easy: just make sure that the PHP module is included in the Apache configuration. If you ve selected to install a LAMP server when installing your server (see 1 for details about this), this is already set up. If it isn t, use apt-get install php to install the

Figure 14-11. Evolution can manage both local calendars and remote calendars from the Internet, making it ideal for creating and sharing group calendars.

A text field containing numbers will order alphabetically, giving an order like 1 , 15 , 109 , 20 245 , 33 , as described in 2 Incorrect types also cause a problem with making comparisons If we ask for values to be compared, the comparison used will depend on how the particular field type involved is sorted For numbers entered in a text field, we will get comparisons such as 109 < 15 or 33 > 245 This will cause some odd output if we ask for people with handicaps less than 5, for example It can be difficult to sort out what is going wrong, because the query syntax is fine and the data appears to be OK Going behind the scenes to check out the data type is certainly not the first thing that may occur to you.

The Memos and Tasks modes are the simplest components within Evolution. Memos mode allows you to jot down simple notes, and Tasks mode allows you to create a to-do list. In both modes, which can be selected by clicking their buttons at the bottom left of the screen, the program window consists simply of an area where you can click to add a new memo/task, a list area, and a preview area, which will show any details of the currently selected task.

PHP software and next create a symbolic link in /etc/apache2/mods-enabled that refers to /etc/apache2/mods-available/php5.conf. The biggest advantage of PHP is that you can use it to make your web pages dynamic. PHP is like Bash shell scripting: it can perform calculations based on certain conditions and execute a command only if a certain condition is true. If you re interested in learning how to code in PHP I recommend the excellent book Beginning PHP and MySQL 5: From Novice to , Professional, Second Edition by Jason Gilmore (Apress, 2006).

Note Memos created in Evolution can also be opened in Tomboy, the default GNOME desktop note-taking application.