I am totally new to PHP, I want to know whats the difference between PHP,CakePHP and Joomla. Which IDE is most commonly used for developing PHP based web applications.
How Ajax is implemented in PHP, is it through JQuery only or there's something more to it. Which will be the ideal book that covers most of the basic and advance concepts.
PHP is a programming language
CakePHP is a framework
joomla is a CMS
AJAX - php is executed server-side and as such isn't something "implementing" ajax. The original call comes from client-side javascript that is not limited to JQuery. JQuery is a javascript library.
Ajax isn't implemented in PHP. Ajax is client-side technology. PHP is server-side. I started using Eclipse's PHP IDE, but I found the debugger to be more of a hassle than it was worth. I'm still using the IDE, but I'd probably be just as well off with a plain text editor.
You might want to check out Zend (www.zend.com). Most of their tools are commercial based, but they have some free tools that help you run PHP on your own machine.
I don't personally use a PHP framework, so someone else will have to help you with that one.
When I was first introduced to PHP, I was directed to these free instructional videos.
While they don't directly address your question, I'd be wrong to not perpetuate the kindness by sharing them with a new, novice enthusiast.
Good luck!
PHP is a programming language.
CakePHP is a framework written in PHP.
Frameworks establish a basis for quickly developing applications by providing you with a lot of functionality that you would have to write in plain PHP for most applications anyway. For example, secure database access, session management or pagination. These are all tedious things you have to care about, but that are basically the same for every app. It also establishes a certain structure for your project.
Joomla is a CMS, a content management system, written in PHP.
CMSes are pre-built systems you can use as-is, that allow you to manage your content. They're extensible and customizable, but often not to the degree that an app written in plain PHP or using a framework can afford, or not easily so. There's a lot of functionality in there already though that you don't need to write at all.
AJAX is not implemented in PHP at all.
AJAX just means that Javascript asks your server for data and the server delivers it.
A typical PHP page responds to requests with a complete HTML webpage. For AJAX requests your server instead responds with XML, JSON or plain text, whatever you decide. It works exactly the same way as responding with an HTML page.
Javascript is a programming language.
jQuery is a library written in Javascript.
See framework, the definition is almost the same.
For IDE recommendations, do a search.
A little-known but powerful solution for AJAX in PHP is Xajax. It allows you to call PHP functions asynchronously as AJAX calls, making it by far the most familiar solution for people familiar with PHP but not Javascript.
Beware, however, that a huge portion of the users are based in Europe so the help forum can be VERY difficult to understand and official documentation is similarly spotty.
I personally always advise against using a book to learn--stick to quality websites (which ones become very obvious very quickly) By the time something is put into print, it's usually out of date or has been superseded by better technique. While the basics don't change much, there are many day-to-day things that experienced developers use regularly that you won't find in a book. I also advise learning the basics of development first (object oriented theory, logic progression, arrays, etc) before learning the specifics of any language. PHP.net can define specifics all day, but it's far more difficult and time consuming to learn MVC theory on the fly. Finally, if you have some money, I can't say enough good about Zend's certification training.
You are asking a lot of questions at once, which are fairly simple questions but the real answer is you need to learn a bit more about web development in general in order to give yourself a broad knowledge of the web development ecosystem. Stack Overflow is not good at giving you 'how do I program in PHP', it's better for specific questions like 'how do I sort an array by string size' or something like that. For learning how to program, you need to learn this yourself.
The wikipedia page on web development gives a very broad overview of how things like server-side, client-side etc fit together - so broad as to not be particularly useful for those wanting to achieve anything in particular, but suitable for people coming across web development from not knowing the difference between an application and a programming language. An equally broad knowledge of http is also helpful, and since you brought it up, it also looks like you are having difficulty understanding what ajax is.
For PHP specifically, the PHP manual contains everything you need for all but the most obscure questions, providing you have picked up a few programming skills already - and if not, I recommend you take a course or something, since if you haven't been programming since you were a child you probably won't take to this kind of thing quickly.