Learn to enjoy every minute of your life.Only I can change my life.

The limitations of cookies :- 1) the cokkie specification says that  I) no cookie can exceed 4KB in size, II) only 20 cookies are allowed per domain , III) and a total of 300 cookies can be stored on the client side 2) There is no control over when the browsers actually expire cookies. Type juggling :- 1) The conversion of a value from one type to another is called casting. 2) This kind of implicit casting is called type juggling in PHP. Regular expressions:- 1) Definition :- A regular expression is a string that represents a pattern .The regular expression functions compare that pattern to another string and see if any of the string matches the pattern .Some functions tell you whether there was a match, while others make changes to the string. 2) PHP provides support for two different types of regular expressions : 1) POSIX and  2) Perl- compatible 3) POSIX regular expressions are less powerful and sometimes slower , than the Perl - compatible ...

Why design pattern? To make project new libraries are created. New classes can be used for further program i.e. Classes are reusable. Thus the problem which is reusable is design pattern. Definition Design Pattern Each pattern describes a problem which occurs over and over again in our environment and then describes the code of the solution to that problem in such a way that you can use this solution a million times over without ever doing it the same way twice. Elements of design pattern :- 1) Pattern name 2) Problem 3) Solution 4) Consequences The person requires documentation for design pattern i.e. Describing design pattern. For this there are as follows:- 1) Pattern name and classification 2) Intent 3) Also known as ( different names for them e.g. Abstract class has user class name ) 4) Motivation ( why person problem to motivate for design pattern ) 5) Applicability ( Real life situations where used ) 6) Structure ( data structures ) 7) Participants ( o...