Wiley Professional CodeIgniter 978-0-470-28245-8 Benutzerhandbuch

                                Welcome to the  MVC  Wor ld          

 This book is about CodeIgniter and the world of Model - View - Controller  (MVC)  web  development. 
Before venturing into the topic of CodeIgniter, it ’ s helpful to put it into some kind of context. 
However, most programmers who are new to the world of MVC web development find some of 
the concepts hard to grasp at first  —  they ’ ve been so engrained in the old way of doing things that 
unlearning is difficult at first. 

 So even before you can learn anything about CodeIgniter or even MVC, it ’ s probably helpful to 
start the discussion with something you already know and understand, and then move on from 
there. Therefore, that ’ s where this book begins: with a description of a prototypical PHP project, 
most likely very similar to anyone ’ s very first PHP project. 

 Many PHP programmers learn PHP either as their first language (having only been exposed to 
XHTML and CSS beforehand) or after learning another similar language (such as Perl). Most of the 
time, a PHP programmer ’ s first few projects involve a pretty steep learning curve, but eventually 
the programmer finds a comfortable groove. He ends up with a project consisting of the following 
components: 

  A series of PHP pages with intermingled PHP commands, SQL queries, and XHTML  

  A series of JavaScript and CSS files that are linked from those PHP pages  

  A series of universal includes  —  a footer file for all pages and a header file that contain the 
database connection and session initialization code  

  A handful of database tables that store the application ’ s  data    

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