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authorwei <>2007-01-14 02:10:24 +0000
committerwei <>2007-01-14 02:10:24 +0000
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tree2480dae3350e4a70949956c41984cceb8dce3efc /demos/quickstart/protected/pages/GettingStarted/AboutPrado.page
parent898049a4012eaecd99e7a418726215e656677809 (diff)
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<com:TContent ID="body" >
<h1 id="201">What is PRADO?</h1>
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PRADO is a component-based and event-driven programming framework for developing Web applications in PHP 5. PRADO stands for <b>P</b>HP <b>R</b>apid <b>A</b>pplication <b>D</b>evelopment <b>O</b>bject-oriented.
</p>
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A primary goal of PRADO is to enable maximum reusability in Web programming. By reusability, we mean not only reusing one's own code, but also reusing other people's code in an easy way. The latter is more important as it saves the effort of reinventing the wheels and may cut off development time dramatically. The introduction of the concept of component is for this purpose.
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To achieve the above goal, PRADO stipulates a protocol of writing and using components to construct Web applications. A component is a software unit that is self-contained and can be reused with trivial customization. New components can be created by simple composition of existing components.
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To facilitate interacting with components, PRADO implements an event-driven programming paradigm that allows delegation of extensible behavior to components. End-user activities, such as clicking on a submit button, are captured as server events. Methods or functions may be attached to these events so that when the events happen, they are invoked automatically to respond to the events. Compared with the traditional Web programming in which developers have to deal with the raw POST or GET variables, event-driven programming helps developers better focus on the necessary logic and reduces significantly the low-level repetitive coding.
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In summary, developing a PRADO Web application mainly involves instantiating prebuilt component types, configuring them by setting their properties, responding to their events by writing handler functions, and composing them into pages for the application. It is very similar to RAD toolkits, such as Borland Delphi and Microsoft Visual Basic, that are used to develop desktop GUI applications.
</p>
<h2 id="202">Why PRADO?</h2>
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PRADO is mostly quoted as a unique framework. In fact, it is so unique that it may turn your boring PHP programming into a fun task. The following list is a short summary of the main features of PRADO,
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<li>Reusability - Code following the PRADO component protocol are highly reusable. Everything in PRADO is a reusable component.</li>
<li>Event-driven programming - End-user activities, such as clicking on a submit button, are captured as server events so that developers have better focus on dealing with user interactions.</li>
<li>Team integration - Presentation and logic are separately stored. PRADO applications are themable.</li>
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</ul>
<h2 id="203">What Is PRADO Best For?</h2>
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PRADO is best suitable for creating Web front-ends that are highly user-interactive and require small to medium traffic. It can be used to develop systems as simple as a blog system to systems as complex as a content management system (CMS) or a complete e-commerce solution. PRADO can help you cut your development time significantly.
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PRADO does not exclude other back-end solutions such as most DB abstraction layers. In fact, they can be used like what you usually do with traditional PHP programming.
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Without caching techniques, PRADO may not be suitable for developing extremely high-traffic Web applications, such as popular portals, forums, etc. In these applications, every niche of potential performance gain must be exploited and server caching (e.g. Zend optimizer) is almost a must. PRADO implements a generic cache technique and enables selective caching of part of Web contents.
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<h2 id="204">How Is PRADO Compared with Other Frameworks?</h2>
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PRADO is described as a unique framework. Its uniqueness mainly lies in the component-based and event-driven programming paradigm that it tries to promote. Although this programming paradigm is not new in desktop application programming and not new in a few Web programming languages, PRADO is perhaps the first PHP framework enabling it.
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Most PHP frameworks are trying to establish a loose standard of organizing PHP programming, most preferably the MVC (model-view-controller) model. It is difficult to compare PRADO with these frameworks because they have different focuses. What we can say is, PRADO is more like a high-level language built upon PHP, while the MVC frameworks stand for the best programming practices. Both aim to help developers to rapidly complete Web application development. The advantage of PRADO is its rich set of prebuilt powerful components and extreme reusability of the PRADO code, while the advantage of the MVC frameworks is the complete separation of model, view and controller, which greatly facilitates team integration.
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<h2 id="205">History of PRADO</h2>
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The very original inspiration of PRADO came from Apache Tapestry. During the design and implementation, I borrowed many ideas from Borland Delphi and Microsoft ASP.NET. The first version of PRADO came out in June 2004 and was written in PHP 4. Driven by the Zend PHP 5 coding contest, I rewrote PRADO in PHP 5, which proved to be a wise move, thanks to the new object model provided by PHP 5. PRADO won the grand prize in the Zend contest, earning the highest votes from both the public and the judges' panel.
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In August 2004, PRADO started to be hosted on SourceForge as an open source project. Soon after, the project site <a href="http://www.xisc.com/">xisc.com</a> was announced to public. With the fantastic support of PRADO developer team and PRADO users, PRADO evolved to version 2.0 in mid 2005. In this version, Wei Zhuo contributed to PRADO with the excellent I18N and L10N support.
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In May 2005, we decided to completely rewrite the PRADO framework to resolve a few fundamental issues found in version 2.0 and to catch up with some cool features available in Microsoft ASP.NET 2.0. After nearly a year's hard work with over 50,000 lines of new code, version 3.0 was finally made available in April 2006.
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Starting from version 3.0, significant efforts are allocated to ensure the quality and stability of PRADO. If we say PRADO v2.x and v1.x are proof-of-concept work, we can say PRADO 3.x has grown up to a project that is suitable for serious business application development.
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