there are many frameworks now,you can search them on google. for example:

1. Qcodo Development Framework
   The Qcodo Development Framework is an open-source PHP 5 framework that focuses on freeing developers from unnecessary tedious, mundane coding.The result is that developers can do what they do best: focus on implementing functionality and usability, improving performance and ensuring security.

   It is a completely object-oriented framework that takes the best of PHP and provides a truly rapid application development platform. Initial prototypes roll out in minutes instead of hours. Iterations come around in hours instead of days (or even weeks). As projects iterate into more cohesive solutions, the framework allows developers to take prototypes to the next level by providing the capability of bringing the application maturity.

   The framework consists of two main components: the Code Generator and Qforms (see below for more). While the framework was designed to support the complexities of large projects, it is an incredibly lightweight framework which can be utilized by small and large web applications alike.

2. CakePHP

   Cake is a rapid development framework for PHP which uses commonly known design patterns like ActiveRecord, Association Data Mapping, Front Controller and MVC. Our primary goal is to provide a structured framework that enables PHP users at all levels to rapidly develop robust web applications, without any loss to flexibility.

3. ZOOP Zoop is an object oriented PHP framework. Zoop is modeled after the MVC design pattern. It is a high performance, secure, and scalable framework for PHP. It is designed to be very fast and efficient and very nice for the programmer to work with. Zoop has been built in a modular way so it is both easily extensible, and light. It has been in development and production use since 2001 and is quite mature.

1. In url “&” must change to “&”
2. <h2></h2> between them you can include other elements like <a>, but you can include <h2> in tags <a>.
3. like <ul></ul>, you must include child elements in them, or there would be a error.
4. you must close all of the tags.

wikipedia is a famous wiki project based on PHP/MYSQL/other database.There are many websites used it to be successed. Like http://www.wikipedia.org.

The wikipedia is simple to use but has lots of functions. there is just a disadvantage that it has not a perfect admin cpanel.

you must be attention to some extra config in LocalSettings.php.

// set group rights to guest

$wgGroupPermissions[’*'    ][’createaccount’]   = true;
$wgGroupPermissions[’*'    ][’read’]            = true;
$wgGroupPermissions[’*'    ][’edit’]            = true;
$wgGroupPermissions[’*'    ][’createpage’]      = true;
$wgGroupPermissions[’*'    ][’createtalk’]      = true;

// set rights to register user

$wgGroupPermissions[’user’ ][’move’]            = true;
$wgGroupPermissions[’user’ ][’read’]            = true;
$wgGroupPermissions[’user’ ][’edit’]            = true;
$wgGroupPermissions[’user’ ][’createpage’]      = true;
$wgGroupPermissions[’user’ ][’createtalk’]      = true;
$wgGroupPermissions[’user’ ][’upload’]          = true;
$wgGroupPermissions[’user’ ][’reupload’]        = true;
$wgGroupPermissions[’user’ ][’reupload-shared’] = true;
$wgGroupPermissions[’user’ ][’minoredit’]       = true;
$wgGroupPermissions[’autoconfirmed’][’autoconfirmed’] = true;

// set rights to serchengine bot
$wgGroupPermissions[’bot’  ][’bot’]             = true;
$wgGroupPermissions[’bot’  ][’autoconfirmed’]   = true;

// set extra rights to admin

$wgGroupPermissions[’sysop’][’block’]           = true;
$wgGroupPermissions[’sysop’][’createaccount’]   = true;
$wgGroupPermissions[’sysop’][’delete’]          = true;
$wgGroupPermissions[’sysop’][’deletedhistory’]  = true;
$wgGroupPermissions[’sysop’][’editinterface’]   = true;
$wgGroupPermissions[’sysop’][’import’]          = true;
$wgGroupPermissions[’sysop’][’importupload’]    = true;
$wgGroupPermissions[’sysop’][’move’]            = true;
$wgGroupPermissions[’sysop’][’patrol’]          = true;
$wgGroupPermissions[’sysop’][’protect’]         = true;
$wgGroupPermissions[’sysop’][’rollback’]        = true;
$wgGroupPermissions[’sysop’][’upload’]          = true;
$wgGroupPermissions[’sysop’][’reupload’]        = true;
$wgGroupPermissions[’sysop’][’reupload-shared’] = true;
$wgGroupPermissions[’sysop’][’unwatchedpages’] = true;
$wgGroupPermissions[’sysop’][’autoconfirmed’]   = true;

php is so great without any commany background, and gets a high point.It’s so
useful and simple that so many users are inserted in.May be I should start
another project based on php.

Moodle

Moodle is a course management system (CMS) - a free, Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities. You can download and use it on any computer you have handy (including webhosts), yet it can scale from a single-teacher site to a 40,000-student University.
offical: http://www.moodle.org/

ATutor

ATutor is the first fully inclusive LCMS, complying with the W3C WCAG 1.0 accessibility specifications at the AA+ level, allowing access to all potential learners, instructors, and administrators, including those with disabilities who may be accessing the system using assistive technologies. Conformance with W3C XHTML 1.0 specifications ensures that ATutor is presented consistently in any standards compliant technology.

ATutor has also adopted the IMS/SCORM Content Packaging specifications, allowing content developers to create reusable content that can be swapped between different e-learning systems. Content created in other IMS or SCORM comformant systems can be imported into ATutor, and visa versa. ATutor also includes a SCORM 1.2 Runtime Environment (LMS RTE3) for playing and managing SCORM based Sharable Content Objects (SCOs).
offical:http://www.atutor.ca/

Dokeos

Dokeos is an Open Source elearning and course management web application translated in 34 languages and helping more than 1.000 organisations worldwide to manage learning and collaboration activities.

offical:http://www.dokeos.com/

Choose a good system,then you is close to success building a good website.