PHP Interview Questions

PHP Interview Questions Download PHP Interview Questions PDF

PHP Interview Questions

PHP supports 9 primitive types

4 scalar types:

  • integer
  • boolean
  • float
  • string

3 compound types:

  • array
  • object
  • callable

And 2 special types:

  • resource
  • NULL

Read Zend Framework interview questions

Include :-Include is used to include files more than once in single PHP script.You can include a file as many times you want.

Syntax:- include(“file_name.php”);

Include Once:-Include once include a file only one time in php script.Second attempt to include is ignored.

Syntax:- include_once(“file_name.php”);

Require:-Require is also used to include files more than once in single PHP script.Require generates a Fatal error and halts the script execution,if file is not found on specified location or path.You can require a file as many time you want in a single script.

Syntax:- require(“file_name.php”);

Require Once :-Require once include a file only one time in php script.Second attempt to include is ignored. Require Once also generates a Fatal error and halts the script execution ,if file is not found on specified location or path.

Syntax:- require_once(“file_name.php”);

PHP sessions are stored on server generally in text files in a temp directory of server.
That file is not accessible from outside word. When we create a session PHP create a unique session id that is shared by client by creating cookie on clients browser.That session id is sent by client browser to server each time when a request is made and session is identified.
The default session name is “PHPSESSID”.

PHP: Hypertext Preprocessor is open source server-side scripting language that is widely used for creation of dynamic web applications.It was developed by Rasmus Lerdorf also know as Father of PHP in 1994.

PHP is a loosely typed language , we didn’t have to tell PHP which kind of Datatype a Variable is. PHP automatically converts the variable to the correct datatype , depending on its value.