Top Most PHP Interview Questions and Answers

Question 1: What is the current version of PHP?

The latest stable version of PHP is 7.0.5 released at 31 March 2016 .

Question 2: What is PHP?

PHP is an open source server side scripting language used to develop dynamic websites . PHP stands for Hypertext Preprocessor , also stood for Personal Home Page . Now the implementations of PHP is produced by The PHP group .It was created by Rasmus lerdorf in 1995 . It is a free software released under the PHP license .

Question 3: Who is the father of PHP?

Rasmus Lerdorf known as the father of PHP . Php was created by Rasmus Lerdorf In 1995 .

Question 4: What is the current version of Apache?

The latest stable version of Apache is 2.4.20, released on 11th april 2016.

Question 5: What is the current version of MySQL?

The latest stable version of MySQL is 5.5, released on 2016-05-03.

Question 6: Which programming language does PHP resemble to?

PHP syntax resembles Perl and C

Question 7: What does PEAR stands for?

PEAR means “PHP Extension and Application Repository”. it extends PHP and provides a higher level of programming for web developers.

Question 8: How do you execute a PHP script from the command line?

Just use the PHP command line interface (CLI) and specify the file name of the script to be executed as follows:

  php script.php

Question 9: How to run the interactive PHP shell from the command line interface?

Just use the PHP CLI program with the option -a as follows:

  php -a

Question 10: What is the main difference between PHP 4 and PHP 5?

PHP 5 presents many additional Object Oriented Programming (OPPS) features.

Question 11: Is multiple inheritance supported in PHP?

PHP includes only single inheritance, it means that a class can be extended from only one single class using the keyword ‘extended’.

Question 12: What type of operation is needed when passing values through a form or an URL?

If we would like to pass values through a form or an URL then we need to encode and to decode them using htmlspecialchars() and urlencode().

Question 13: What is the difference between Sessions and Cookies in PHP?

The main difference between a session and a cookie is that session data is stored on the server, whereas cookies store data in the visitor’s browser. There are some difference between session and cookies thath are as following-

Session are temporary and Cookies are permanent.
Session data is store on server while Cookies are store on user’s computer.
Cookies contents can be easily modify but to modify Session contents is very hard.
Cookies could be save for future reference but Session couldn’t when user close the browser Session data also lost.

Question 14: What is difference between unset and unlink.

Unset is a function for variable management. Unset is used to destroy a variable in PHP and unlink is a function for file system handling, unlink is used to delete files.

Question 15: How is the ternary conditional operator used in PHP?

It is composed of three expressions: a condition, and two operands describing what instruction should be performed when the specified condition is true or false as follows:

expression1 ? expression2 : expression3;

  variable = (condition) ? value-if-true : value-if-false;