CORE PHP PART - 1 PROBABLE INTERVIEW QUESTIONS AND ANSWERS MADE BY ME WHICH ARE GENERALLY ASKED IN vEXPLORE TECHNOLOGIES FOR PHP WEB DEVELOPMENT FOR FRESHERS

Q1. What are superglobals in PHP? Explain $_GET, $_POST,$_SESSION,etc.

Ans: Superglobals in PHP are known as the pre-defined global variables. For ex. : $_SESSION, $_POST,$_COOKIES, $_GET, $_REQUEST, $_FILES, etc.

$_GET = $_GET is the unsecure method. Query string can pass through $_GET method.

$_POST=$_POST is the most secure method. Query string cannot pass through $_POST method.

$_SESSION= $_SESSION is known as the global carrier of data which trace the user activity on website. It is used to send the user information on server. $_SESSION is the unsecure method. $_SESSION does not have any limit. For ex. : Login, Logout, Multipart Form.

Q2. What is the use of header() function?

Ans: header() function in PHP is used to sent the raw HTTP header to the client. For ex. :

header("location:display.php"); ,

header("location:login.php"); , etc.

Q3. How does explode() differ from implode()?

Ans: explode() = explode() function is used to convert from string into array.

For ex. :

<?php

$str="Capgemini was my first company";

$exp=explode(" ",$str);

print_r($exp);

?>

Output :

Array ( [0] => Capgemini [1] => was [2] => my [3] => first [4] => company )

implode() = implode() function is used to convert from array into string.

For ex. :

<?php

$arr="I love Capgemini";

$exp=explode(" ",$arr);

$imp=implode(" ",$exp);

print_r($imp);

?>

Output :

I love Capgemini