Web 2.0 is a trend in the use of World Wide Web technology and web design that aims to facilitate creativity, information sharing, and, most notably, collaboration among users. These concepts have led to the development and evolution of web-based communities and hosted services, such as social-networking sites, wikis, blogs, and folksonomies (the practice of catgorising content through tags). Although the term suggests a new version of the World Wide Web, it does not refer to an update to any technical specifications, but to changes in the ways software developers and end-users use the internet.

Its not mandate that one should mastered in VB script to work with QTP. It is mostly user friendly and for good results we need to have basic VB or concepts which will suffice

Encapsulation, Object class and instance

PHP4 cannot support oops concepts and Zend engine 1 is used.
PHP5 supports oops concepts and Zend engine 2 is used.
Error supporting is increased in PHP5.
XML and SQLLite will is increased in PHP5.

In software engineering the concept of abstraction is extremely important. Microsoft calls its own language abstraction layer the Common Intermediate Language (CIL). Similar to byte code like Java generates IL supports all object oriented features including data abstraction, inheritance, polymorphism, etc. In addition to these features IL supports other concepts such as properties, fields and enumeration. Any .net language can be converted into IL, so .net supports multiple languages and perhaps multiple platforms. CIL is also called as MSIL (Microsoft Intermediate Language). When .net code is compiled it is converted into IL, which is then executed. Because of IL objects created in one language can be accessed and derived from another. E.g. it is possible to create a class in VB.Net and derive from it in C#.

CTS is an acronym for Common Type System which is an integral part of .net and which ensures language compatibility, interoperability and integration. Because .net treats all languages equal a class written in C# should be equivalent to class written in VB.net. Languages must agree on the meaning of these concepts before they can integrate with one another. To make this integration possible Microsoft has specified a common type system which every .net language must follow. There are two types in CTS: value type and reference type. Value types reference values on the stack. When a value type is passed to a function they are passed by value i.e. original value of the passed variable will not change. If a type consumes memory then it should be declared as a reference type. They contain references to heap based objects and are reclaimed by the garbage collector. When you pass a variable by reference then if the called function modifies it, it is visible in the calling function because it works on the actual object contrast to value type where a copy of the object is passed.