PHP Interview Questions and Answers

What is PHP?
The PHP Hypertext Preprocessor is a programming language that allows web developers to create dynamic content that interacts with databases. PHP is basically used for developing web based software applications.
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
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 .
What is use of header() function in php ?

The header() function sends a raw HTTP header to a client.We can use header() 
function for redirection of pages. It is important to notice that header() must
be called before any actual output is seen.

What is meant by nl2br()?

Inserts HTML line breaks (<BR />) before all newlines in a strin

How we get IP address of client, previous reference page etc ?
By using $_SERVER['REMOTE_ADDR'],$_SERVER['HTTP_REFERER'] etc.

How can we register the variables into a session?
$_SESSION['name'] = 'me';
What are the different types of error in php?

three basic types of runtime errors in PHP:

1. Notices: These are trivial, non-critical errors that PHP encounters while executing a
script for example, accessing a variable that has not yet been defined.
By default, such errors are not displayed to the user at all although 
you can change this default behavior.

2. Warnings: These are more serious errors for example, attempting to include() a file 
which does not exist. By default, these errors are displayed to the user, but they do 
not result in script termination.

3. Fatal errors: These are critical errors  for example, instantiating an object of a non-existent class,
or calling a non-existent function. These errors cause the immediate termination of the script, and PHP 
default behavior is to display them to the user when they take place.

Latest Updates

Direction

Swapnil start from his home and walked 35 km towards east, after that he turned to his right and walked 20 km. He again turned to his right and walks 35 km. Finally, he turned to his left and walked 20 km and reached his office. How far is his office from his home?

Numbers

How many 2 digit numbers are divisible by 6?

HCF and LCM

Find the smallest square number which is exactly divisible by 3, 5, 15, 18, 20 and 24?

HCF and LCM of two numbers are 82 and 574 respectively. if one of the numbers is 287, find the second number?

Numbers

How many numbers between 1200 to 1500 are multiple of 13?

Find the total number of terms in the series : -3, 1, 5, 9,............., 101 ?

Find the sum of the first 20 terms of the series : 8, -3, 11, -6, 14, -12, 17, -24,....... ?

Series

Find the missing term in the given series - 101, 120, 145, 168, (?), 224

Find the missing term in the given series - 11A13, 17E19, (?), 31O37, 41U43

Find the missing term in the given series - 2,4,8,3,9,27,4,16,(?),5,25,125

Agriculture

Which gas is fixed by Rhizobium bacteria present in the root nodules of a pea plant ?

Chemistry

The formation of sulphurous acid involves ?

The acid present in soft drinks is ?

The cathode of a dry cell is made of ?

The number of atoms present in the molecule of an element is known as its?

Physics

If the angle of incidence formed by a ray of light on a plane mirror is 37°, then the angle of refraction is?

A dynamo converts ?

If the time taken for hearing the echo of a girl's voice after reflection from a cliff is 6 seconds, calculate the distance of the girl from cliff ?