Drupal6 and Drupal 7 difference

Difference between drupal 7 and 6
Drupal 7 requires new system requires such as MySQL 5.0.15 or PostgreSQL 8.3, PHP
Version 5.2 or higher and PHP Memory of 40M - 64M
1.More secure implementation for scheduled tasks (cron.php)
2.More secure password system
3.More secure log-in system
4.Modules can be updated via the web
5.Administrative links to edit existing page elements on each page
6.Improved support for integration of WYSIWYG editors
7.More drag-and-drop for administrative tasks
8.Permissions now have the ability to handle more meta-data
9.User 1 created as part of the installation process
10.Added features to the default install profile
11.Automated task runs can be set up via configuration
12.Redesigned password strength validator
13.Renamed "input formats" to "text formats"
14.Added support for default text formats to be assigned on a per-role basis
15.Moved text format permissions to the main permissions page
16.Added "vertical tabs"
17.Improved time zone support
18.Removed per-user themes
19.Added new "Shortcuts" module

20.Added query builders for INSERT, UPDATE, DELETE, MERGE, and SELECT queries
21.Support for master/slave replication, transactions, multi-insert queries,delayed inserts,
and other features
22.Added support for the SQLite database engine
23.Default to InnoDB engine, rather than MyISAM, on MySQL when available for greater
scalability and data integrity
24.Hook API documentation included in Drupal core
25.Added OPML import functionality for RSS feeds
26.Added feed update options
27.Added support for language-aware searches
28.Added test framework and tests
29.Remove some themes and added other themes as default on user and admin interface
30.Files are now first class Drupal objects with file_load(), file_save(), and file_validate()
functions and corresponding hooks.
31.Files use PHP stream wrappers to enable support for both public and private files and
to support pluggable storage mechanisms and access to remote resources
32.Added a field specifically for uploading files
33.Improved image handling
34.Added a field specifically for uploading images
35.Better Support for Multisite Installations
36.Added RDF support
37.Better support for search engine optimization and web linking
38.Added ability to add custom fields

39.Installer can be run from the command line
40.Upgrades made to core JavaScript library, JQuery Forms library
41.Added jQuery UI 1.8
42.Improved node access control system
43.Improved handling of long-running tasks
44.In drupal 7, new concept of entity introduce. Entity is generic concept which may be
node, user profile, comment, taxonomy-term
45.In drupal 7, user reference and node reference is replaced by enitity reference.
46.In drupal 7, CCK is now core module.
47.In drupal 7, we can create shortcut.
48.In drupal 7, we can shedule the task using cron.
49.In drupal 7, system requirement reduced.
50.In drupal 7, coding section drupal 7 use PDO.
51.In drupal 7, there is db_result function.
52.In drupal 7, there is two argument in db_query.
Drupal module
A Drupal module is a collection of files containing some functionality
and is written in PHP.
Because the module code executes within the context of the site, it
can use all the functions and access all variables and structures of
Drupal core.
In fact, a module is no different from a regular PHP file that can be
independently created and tested and then used to drive multiple
functionalities.

This approach allows Drupal core to call at specific places certain
functions defined in modules and enhance the functionality of core.
The places where code can be executed are called "hooks" and are
defined by a fixed interface.
Hooks
Drupal modules work on a event like system called hooks.
A hook is a way for you to place a piece of your own custom
code to be run by Drupal at a very specific time.
Using hooks, you can ask Drupal to run a piece of your code
precisely when a comment is viewed, or a node is edited or a
search result is displayed.
You don't actually create hooks.
You use helper functions such as module_invoke_all(),
module_invoke() or drupal_alter() to invoke all functions
matching the expected name pattern.
The invoked functions are usually found with
module_implements().
Advantages of Drupal
Includes a lot of functionality
Drupal includes lot of functionalities like: advanced menu management, polls
management, graphics modification tool, users management and much more. These
functions make it possible to create simple or advanced websites, blogs, discussion
boards, social networking pages, etc.

Variety of content types
Drupal is famous for allowing to create and manage many content types, like: videos,
polls, user management, text, blogs, podcasts, statistics, and others.
Advanced users management
An administrator can create new user accounts and establish their permission rights.
Users can be divided into groups and can be given assignments. They can be given
permissions to manage parts of your website.
Graphics management
The script includes capabilities of design elements editing. Available templates and
themes make for a good start. Predefined page functions configurations make it easy to
create both a simple as well as more complicated page configurations.
Page content management
Drupal allows you to categorize your content through URL addresses, paths, making your
own lists. This structure makes for easy management, search and reuse of the content.
Plugins
The script has several thousands of plugins available on its website. Since Drupal is an
Open Source, you can use as well as create your own plugins.
Support
On the Drupal homepage, there's a documentation, well developed discussion board, chat,
mailing list, etc. You can find there plenty of information and help concerning managment
and modification of the script.

Disadvantages of Drupal
Installation and modification
The script is not very user-friendly and requires advanced knowledge to install and modify.
Quick.Cms, WordPress and even Joomla are simpler to use, even thoug they do not offer
functionalities as rich as Drupal does.
Compatibility
Drupal have planty of new solutions. If you're used to older systems, getting used to this
script will take some time.
Efficiency
When considering scalibility and efficiency, Drupal is far behind other scripts like
Quick.Cms or WordPress. If your website is very large, the script will generate a big server
load. It is caused by the big range of possibilities provided by Drupal. There are however
plugins that load a website to the server's cache, what decreases the server load.

Drupal6 and Drupal 7 difference

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