1. Introduction:
Contrexx is a powerful Open Source Web Content Management System (WCMS) which will assist you in the creation, administration and maintenance of contents for the inter-net or intra-net. It's a completely web-based system with an easy-to-use WYSIWYG editor and intuitive user interface. Contrexx is very flexible, by adding modules you can customize the CMS according to your individual demands and it requires no technical knowledge or previous training.

2. Pre – Installation:
Installation of contrexx cms requires a working web server such LAMP, XAMP or WAMP. If have you got a correctly configured web server continue downloading the source package from Contrexx – Download. Unzip the downloaded source zip to DocumentRoot(Generally DocumentRoot means '/var/www/') of your web server. Rename the unzipped folder to contrexx. By Default, all the installation files comes inside of /contrexx/CMS_FILES, move all those files to the /contrexx (this step is optional).

3. Installation:
Now point your browser to the location where you unzipped the files. In my case it is http://192.168.2.58/gowri/Project/contrexx/.
Now you can see a installation welcome screen. On the next screen you will be asked for the license agreement. On agreeing those things you will be redirected to System requirement check page. If your web server satisfies all the requirements. You will be allowed to the next configuration step.

4.Configuration:
In the configuration step you will be asked for the databse name and the mysql username and password for creating a database and required tables with data for the project. In the hostname field give our hostname, localhost in general. Then provied the name for the database in the next field, if you have already created a database uncheck the 'create database' and provide the name or else check it and make sure no other database exsist in the server with same name. Table prefix is the text that u need to have before every table name of the database that is going to be created. In the next fields give the username and password for the MySQL server. If you want FTP connectivity check the 'use FTP' field and provided the correct details or else leave it blank.

5.Installation warning:
At this stage of installation, most of the time you will be prompted with a long list of file permisssion errors. If u get such screen dont get scared, just change the premissions for the installation folder. You can even do this step before starting the installation process.
To change the permission just run this command:
sudo chmod -R -f 777 {folder's physical location from root};
After changing the permission, proceed to the next step by clicking the Next button at the last of the error list.

6. Database Creation:
Now you can see a screen just like the below one, giving the confirmation of creating all the database tables. In the next step you will be asked for the administrator's email id.

7. Administrator's Account
Here you will be prompted to provide the admin username and password. On correctly providing those thing the final success screen comes. Giving the backend and frontend urls.
8. Installation success
Default Front End for visitors:

Admin Panel:

For more information about the Installation of Contrexx CMS:
http://www.contrexx.ch/wiki/de/index.php?title=Contrexx_Manual:Contrexx_Installation_Guide

There are a couple of ways that you can access a shell (command line) remotely on most Linux/Unix systems. One of the older ways is to use the telnet program, which is available on most network capable operating systems. Accessing a shell account through the telnet method though poses a danger in that everything that you send or receive over that telnet session is visible in plain text on your local network, and the local network of the machine you are connecting to. So anyone who can "sniff" the connection inbetween can see your username, password, email that you read, and commands that you run. For these reasons you need a more sophisticated program than telnet to connect to a remote host. 






Unencrypted telnet session


SSH, which is an acronym for Secure SHell, was designed and created to provide the best security when accessing another computer remotely. Not only does it encrypt the session, it also provides better authentication facilities, as well as features like secure file transfer, X session forwarding, port forwarding and more so that you can increase the security of other protocols. It can use different forms of encryption ranging anywhere from 512 bit on up to as high as 32768 bits and includes ciphers like AES (Advanced Encryption Scheme), Triple DES, Blowfish, CAST128 or Arcfour. Of course, the higher the bits, the longer it will take to generate and use keys as well as the longer it will take to pass data over the connection.


Encrypted SSH session


The two diagrams above show how a telnet session can be viewed by anyone on the network by using a sniffing program like Ethereal (now called Wireshark) or Sniffit. It is really rather trivial to do this and so anyone on the network can steal your passwords and other information. The first diagram shows user jsmith logging in to a remote server through a telnet connection. He types his username jsmith and password C0lts06!, which are viewable by anyone who is using the same networks that he is using.

The second diagram shows how an encrypted connection like SSH is not viewable on the network. The server still can read the information, but only after negotiating the encrypted session with the client. 

 

1. If you are having phpmyadmin like interface to access your mysql means, it will be very easier.
   

2. And also you can do export, import operations from command line very easily without any of the above conditions.
   

# mysql -u root -p forum < forumdb.sql

The Directory Structure



I am sure this has great naming convention and we all could understand easily why we are having these folder structure.

application - application specific code
config - database/server configuration
db - database backups
library - framework code
public - application specific js/css/images
scripts - command-line utilities
tmp - temporary data

Once we have our directory structure ready, let us understand a few coding conventions.

Coding Conventions

1. mySQL tables will always be lowercase and plural e.g. items, cars
2. Models will always be singular and first letter capital e.g. Item, Car
3. Controllers will always have “Controller” appended to them. e.g. ItemsController, CarsController
4. Views will have plural name followed by action name as the file. e.g. items/view.php, cars/buy.php

So you know the directory structure of MVC/Zend framework. So now we will start implementing this in real project. Let me explain more detail in next post.

and also there are many other standard frameworks, each one having their own advantages, and zend framework provides great security than anything else we just moving with zend and we will be seeing all the frameworks.

The other frameworks are

Cake PHP
Code Igniter
Symfony
Prado

To know more about zend just check out this

Zend

For more about Php Frameworks please stay with us for some time.

Example of MVC architecture:

Model–View–Controller

Model–View–Controller (MVC) is an architectural pattern used in software engineering. Successful use of the pattern isolates business logic from user interface considerations, resulting in an application where it is easier to modify either the visual appearance of the application or the underlying business rules without affecting the other. In MVC, the model represents the information (the data) of the application; the view corresponds to elements of the user interface such as text, checkbox items, and so forth; and the controller manages the communication of data and the business rules used to manipulate the data to and from the model.


The main aim of the MVC architecture is to separate the
business logic and application data from the presentation
data to the user.

Here are the reasons why we should use the MVC design pattern.

1. They are resuable : When the problems recurs, there is
no need to invent a new solution, we just have to follow the
pattern and adapt it as necessary.
2. They are expressive: By using the MVC design pattern
our application becomes more expressive.

1). Model: The model object knows about all the data that
need to be displayed. It is model who is aware about all the
operations that can be applied to transform that object. It
only represents the data of an application. The model
represents enterprise data and the business rules that
govern access to and updates of this data. Model is not
aware about the presentation data and how that data will be
displayed to the browser.

In simpler terms

Model handles all our database logic. Using the model we connect to our database and provide an abstraction layer.

2). View : The view represents the presentation of the
application. The view object refers to the model. It uses
the query methods of the model to obtain the contents and
renders it. The view is not dependent on the application
logic. It remains same if there is any modification in the
business logic. In other words, we can say that it is the
responsibility of the of the view's to maintain the
consistency in its presentation when the model changes.


In simpler terms

Controller represents all our business logic i.e. all our ifs and else.

3). Controller: Whenever the user sends a request for
something then it always go through the controller. The
controller is responsible for intercepting the requests from
view and passes it to the model for the appropriate action.
After the action has been taken on the data, the controller
is responsible for directing the appropriate view to the
user. In GUIs, the views and the controllers often work very closely together.


In simpler terms

View represents our presentation logic i.e our HTML/XML/JSON code.

If You are planned to develop a project(Stand alone application/Web development) you have to look into many aspects regarding security,code readability and re-usability,understanding and many aspects as per your project goes.

What ever your project domain or what ever your technology chosen for project you will be having directory and file structure. Or else the total system will be confusing and some times the whole project concept will be clopsed. So you should be careful on directory and file structure once you finished your project requirement analysis, and another reason for security reason also you should follow a structured way of programming.

Whether you can define your own file structure or you can have already built in architectures.

If you are planned to write your own file structure means have these things in your mind.

1. Storage

2. Programming

3. GUI

Even stand alone or web application you should have these analysis.

Or if you are planned to use built in architectures means i always recommend you just know about MVC and you will be happily programming. Especially when it comes web application it supports you more than you expect.

Because it is not technology dependent. You can use it in PHP/ASP/JSP

What is MVC Architecture?

The main aim of the MVC architecture  is to separate the business logic and
application data from the presentation data to the user.

Advantages of MVC

1.Modifying isvery easier
2.Clean separation of roles
3.Easy to maintain and future enhancements
4.Parallel development
5.Gives the good productivity

Dis-advantages

1.For parallel development there is a needed multiple programers
2.Knowledge on multiple technologies are required

If you can able to manage above to disadvantages in your project means then i am sure you will be using MVC architecture.