Basic PHP Interview Questions?

-

1) What is PHP? 

  • PHP is a server-side scripting language that is basically used for developing dynamic web pages. 

2) What is the difference between echo( ) and print ( )?

  • echo and print are more or less the same. They are both used to output data to the screen.The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters while print can take one argument. echo is marginally faster than print. 

3) What is print_r( )?

  • This is also an output function used in PHP, It is used to display the whole array in PHP. 

4) How to include files in PHP?

  • We can include a file using "include( )" or "require( )" function with file path as its parameter.

5) What is the difference between GET and POST?

  • We can send small data using GET method but POST method can transfer a large amount of data and POST is secure method than GET method. 

7) How to declare an array in PHP?

  • $arr = array('apple','grape','lemon); 

8) What is the use of in_array( ) in PHP?

  • in_array used to checks if a value exists in an array. 

9) What is the use of count( ) function in PHP? 

  • count( ) is used to count all elements in an array or something in an object.

10) What is the difference between include and require?

  • By using both two functions we include the file in the PHP program, How they handle the failures, If the file is not found by require ( ), it will cause a fatal error and halt the execution of the script. If the file is not found by include( ), a warning will be issued, but execution will continue.

11) What is the difference between Session & Cookie? 

  • The main difference between sessions and cookies is that the session is stored on the server and cookies are stored on the user's computers in text file format. Cookies can not hold multiple variables but the session can hold multiple variables, But Session can hold multiple variables. We can set expiry for a cookie, The session remains active as long as the browser is open. 

12) How to set cookies in PHP?

  • setcookie("sample",time()+3600); 

13) How to retrieve a Cookie value?

  • echo $_COOKIE['user']; 

14) How to create a session? How to set a value in session? How to remove data from a session? 

  • Create session: session_start( );
  • Set value into session: $_SESSION['USER']=1; 
  • unset($_SESSION['USER']);

Comments

Post a Comment

Popular posts from this blog

Basic Terminology

-
What is scripting language? A scripting language is a programming language that supports scripts programs written for a special run time environment that can interpret (rather than compile) automates and executes the tasks that could be alternatively executed by human operator. What is static Web pages? A static web page is the web page that delivered to user exactly as stored in contrast to dynamic web pages which are generated by a web application. What is Dynamic Web Pages?   A server side dynamic web page is controlled by an application server processing server side scripting. What is web server? Web server is the software used to run web application, Main functionality of server is to handle the request from the client and send response to client. What is web browser? The web browser is the software used to open the web application from the web server. Web browser can also execute HTML, Java Script, CSS and other client side script. What is
Read more

What is normalization in DBMS?

-
 Normalization is the technique of organizing the data into multiple tables to minimize data redundancy. Data redundancy means the reputation of data at multiple places. Different issues can be observed while insertion, Updation, Deletion. Unnecessary data reputation will increase the size of the database and leads to more issues. Normalization will break the table into two different tables.
Read more

Object oriented programming concepts in PHP

-
Is it always necessary to create objects from class? No. An object is necessary to be created if the base class has non-static methods. But if the class has static methods, then objects don’t need to be created. You can call the class method directly in this case, using the class name. How much memory does a class occupy? Classes do not consume any memory. They are just a blueprint based on which objects are created. Now when objects are created, they actually initialize the class members and methods and therefore consume memory. Can you create an instance of an abstract class? No. Instances of an abstract class cannot be created because it does not have a complete implementation. However, instances of subclass inheriting the abstract class can be created. What is a final variable? A variable whose value does not change. It always refers to the same object by the property of non-transversity. What are the differences between error and exception? Exception - Exception can be recovered b
Read more