What symbol is used to declare nested namespaces?

  PHP scripts are located in the web server document tree. 

The _____ character is used to represent the logical operator NOT.

How to check if a variable of the specified type exists?

 The date() function returns ___ representation of the current date and/or time. 

Which feature allows you to call multiple methods or functions of a class in a single instruction?

 PHP has long supported two regular expression implementations known as _______ and _______ 

i) Perl
ii) PEAR
iii) Pearl
iv) POSIX 

 Which one of the following function is used to return an array consisting of various DNS resource records pertinent to a specific domain?

Which one of the following statements can be used to establish port 80 connection with www.nachi.com?