Question { 10625 }

what is abstrac class? why it is use?

Answer

Abstract Class is a class , in which at least one method is
declared as abstract.Abstract method is a method for which
implementation is not provided in that class.This method
can be implemented by the classes which inherited the
Abstract class and we can not instantiate the abstract
class.Abstract classes can be used when we want to
partially leave certain methods for inheriting classes to
implement.

Question { 8251 }

What is RSS?How to use it in Program?

Answer

RSS (Previously stood for Rich Site Summary Developed by
the NetScape,but now refers to RDF(Resource Description
Framework) ,an updated xml compliant version of the
Netscape Technology ) is an XML document format intended to
describe the content of a website as a channel

Question { 15395 }

What is the meaning of curl , which is used while connecting
with pay pal? and how it works?

Answer

Curl means client URL , php supports libcurl which allows
you to connect and communicate to many different types of
servers with many different types of protocals .libcurl
currently supports http,https,ftp,gopher,telnet and ldap
protocals.Once you have enabled the php with curl
support.you can use the curl functions.You can intialize a
curl session using the curl_init(),then you can set all
your options for the transfer via the curl_setopt(),then
you can execute the session wiht the curl_exec() and then
you can finish off your session using the curl_close().