concept of reusability dawns. Generally, this means that the code that connects to the database is separated into
a file called something like db.inc.php. Then it seems logical to separate out the code that displays the common
header and footer elements on every page. Functions are introduced to help solve the problem of global
variables affecting one another
As the website grows, common functionality is grouped together into libraries. Before you know it, the
application is much easier to maintain and adding new features becomes possible again. This stage lasts for a
little while and the website continues to expand until it gets to the point where the supporting code is so large
that you can’t hold a picture of how it all works in your head.
PHP coders are used to standing on the shoulders of giants as our language provides easy access to
libraries such as the GD image library, the many database client access libraries and even system specific
libraries such as COM on Windows. It was inevitable that Object-Oriented Programming would enter the PHP
landscape. Whilst classes in PHP4 provided little more than glorified arrays, PHP5 provides excellent support
for all the things you’d expect in an object oriented language. Hence there are visibility specifiers for class
members (public, private and protected) along with interfaces, abstract classes and support for exceptions.
The improved object-oriented support allows for more complicated libraries (known as frameworks) to
evolve, such as the Zend Framework which supports a way of organizing web application files know as the
MVC design pattern. This is shown in Figure 1.2.
POSITION OF DOING SEX FOR HANDSOME CHILD !
