6. How do you execute a PHP script from the command line?
Ans:
Just use the PHP command line
interface (CLI) and specify the file name of the script to be executed as
follows:
php script.php
7. What is session and why do we use it?
Ans:
Session is a super global
variable that preserve data across subsequent pages. Session uniquely defines
each user with a session ID, so it helps making customized web application
where user tracking is needed.
8. What is cookie and why do we use it?
Ans:
Cookie is a small piece of
information stored in client browser. It is a technique used to identify a user
using the information stored in their browser (if already visited that website)
. Using PHP we can both set and get COOKIE.
9. What are the different errors in PHP?
Ans:
There are 4 basically types of
error.
Parse Error – Commonly caused due
to syntax mistakes in codes e.g. missing semicolon, mismatch brackets.
Fatal Error – These are basically
run time errors which are caused when you try to access what can’t be done.
E.g. accessing a dead object, or trying to use a function that hasn’t been
declared.
Warning Error – These occurs when
u try to include a file that is not present, or delete a file that is not on the
server. This will not halt the script; it will give the notice and continue
with the next line of the script.
Notice Error – These errors
occurs when u try to use a variable that hasn’t been declared, this will not
halt the script, It will give the notice and continue with the next line of the
script.
10. What types of loops exist in php?
Ans:
for, while, do while and foreach
11. How can PHP and HTML interact?
Ans:
It is possible to generate HTML
through PHP scripts, and it is possible to pass informations from HTML to PHP.
12. How can PHP and Javascript interact?
Ans:
PHP and Javascript cannot
directly interacts since PHP is a server side language and Javascript is a
client side language. However we can exchange variables since PHP is able to
generate Javascript code to be executed by the browser and it is possible to
pass specific variables back to PHP via the URL.
13. What is CSS?
Ans:
CSS or cascading Style Sheet is a
way to style and present HTML.
14. What is AJAX ?
Ans:
15. What is jQuery?
Ans:
jQuery is a fast, small, and feature-rich JavaScript library. It is an
easy-to-use API which makes things like HTML document traversal and
manipulation, event handling, animation, and Ajax
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