1. Who is the father of
PHP ?
Rasmus Lerdorf is known as the father of PHP.
2. What is the difference
between $name and $$name?
$name is variable where as $$name is reference variable like $name=sonia and
$$name=singh so $sonia value is singh.
3. What are the method
available in form submitting?
GET and POST
4.How can we get the
browser properties using PHP?
<?php
echo
$_SERVER[‘HTTP_USER_AGENT’].”\n\n”;
$browser=get_browser(null,true);
print_r($browser);
?>
5. What Is a Session?
A session is a logical object
created by the PHP engine to allow you to preserve data across subsequent HTTP
requests. Sessions are commonly used to store temporary data to allow multiple
PHP pages to offer a complete functional transaction for the same visitor.
6. How can we register the
variables into a session?
<?php
session_register($ur_session_var);
?>
7. How many ways we can
pass the variable through the navigation between the pages?
Register the variable into the
session
Pass the variable as a cookie
Pass the variable as part of the URL
8. How can we know the
total number of elements of Array?
sizeof($array_var)
count($array_var)
9. How can we create a
database using php?
mysql_create_db();
10. What is the
functionality of the function strstr and stristr?
strstr() returns part of a given
string from the first occurrence of a given substring to the end of the string.
For example:strstr("user@example.com","@") will return
"@example.com".
stristr() is idential to strstr() except that it is case insensitive.
11. What are encryption
functions in PHP?
CRYPT(), MD5()
12. How to store the
uploaded file to the final location?
move_uploaded_file( string
filename, string destination)
13. Explain mysql_error().
The mysql_error() message will
tell us what was wrong with our query, similar to the message we would receive
at the MySQL console.
14. What is Constructors
and Destructors?
CONSTRUCTOR : PHP allows
developers to declare constructor methods for classes. Classes which have a
constructor method call this method on each newly-created object, so it is
suitable for any initialization that the object may need before it is used.
DESTRUCTORS : PHP 5 introduces a destructor concept similar to that of other
object-oriented languages, such as C++. The destructor method will be called as
soon as all references to a particular object are removed or when the object is
explicitly destroyed or in any order in shutdown sequence.
15. Explain the visibility
of the property or method.
The visibility of a property or
method must be defined by prefixing the declaration with the keywords public,
protected or private.
Class members declared public can be accessed everywhere.
Members declared protected can be accessed only within the class itself and by
inherited and parent classes.
Members declared as private may only be accessed by the class that defines the
member.
16. What are the
differences between Get and post methods.
There are some defference between
GET and POST method
1. GET Method have some limit like only 2Kb data able to send for request
But in POST method unlimited data can we send
2. when we use GET method requested data show in url but
Not in POST method so POST method is good for send sensetive request
17. What are the
differences between require and include?
Both include and require used to
include a file but when included file not found
Include send Warning where as Require send Fatal Error
18. What is use of
header() function in php ?
The header() function sends a raw
HTTP header to a client.We can use herder()
function for redirection of pages. It is important to notice that header() must
be called before any actual output is seen.
19. List out the predefined classes in PHP?
Directory
stdClass
__PHP_Incomplete_Class
exception
php_user_filter
20. What type of
inheritance that PHP supports?
In PHP an extended class is always
dependent on a single base class,that is, multiple inheritance is not
supported. Classes are extended using the keyword 'extends'.
21. How can we encrypt the
username and password using php?
You can encrypt a password with
the following Mysql>SET PASSWORD=PASSWORD("Password");
We can encode data using base64_encode($string) and can decode using
base64_decode($string);
22. What is the difference
between explode and split?
Split function splits string into
array by regular expression. Explode splits a string into array by string.
For Example:explode(" and", "India and Pakistan and
Srilanka");
split(" :", "India : Pakistan : Srilanka");
Both of these functions will return an array that contains India, Pakistan, and
Srilanka.
23. How do you define a
constant?
Constants in PHP are defined using
define() directive, like define("MYCONSTANT", 100);
24. How do you pass a
variable by value in PHP?
Just like in C++, put an ampersand
in front of it, like $a = &$b;
25. What does a special
set of tags <?= and ?> do in PHP?
The output is displayed
directly to the browser.
26. How do you call a
constructor for a parent class?
parent::constructor($value)
27. What’s the special
meaning of __sleep and __wakeup?
__sleep returns the array of all
the variables than need to be saved, while __wakeup retrieves them.
28. What is the difference
between PHP and JavaScript?
javascript is a client side
scripting language, so javascript can make popups and other things happens on
someone’s PC. While PHP is server side scripting language so it does every
stuff with the server.
29. What is the difference
between the functions unlink and unset?
unlink() deletes the given file
from the file system.
unset() makes a variable undefined.
30. How many ways can we
get the value of current session id?
session_id() returns the session
id for the current session.
31. What are default
session time and path?
default session time in PHP is
1440 seconds or 24 minutes
Default session save path id temporary folder /tmp
32. for image work which
library?
we will need to compile PHP with
the GD library of image functions for this to work. GD and PHP may also require
other libraries, depending on which image formats you want to work with.
33. How can we get second
of the current time using date function?
<?php
$second = date(“s”);
?>
34. What are the
Formatting and Printing Strings available in PHP?
printf()- Displays a formatted string
sprintf()-Saves a formatted string in a variable
fprintf() -Prints a formatted string to a file
number_format()-Formats numbers as strings
35. How can we find the
number of rows in a result set using PHP?
$result = mysql_query($sql,
$db_link);
$num_rows = mysql_num_rows($result);
echo "$num_rows rows found";
