COMPUTER LANGUAGES | PHP | PHP INTERVIEW QUESTION AND ANSWERS - 04

PHP Interview Question and Answers:

11.     What type of headers that PHP supports?
      $_SERVER[‘HTTP_ACCEPT’]

12.     How can we create a database using php?
      mysql_create_db();

13.     How can we know the total number of elements of Array?     
    sizeof($array_var)
    count($array_var)

If we just pass a simple var instead of a an array it will return 1.

14.     Explain include(), include_once, require() and require_once.
      include()
The include() function takes all the content in a specified file and includes it in the current file. If an error occurs, the include() function generates a warning, but the script will continue execution.

include_once()
File will not be included more than once. If we want to include a file once only and further calling of the file will be ignored then we have to use the PHP function include_once().

require()
The require() function is identical to include(), except that it handles errors differently. The require() generates a fatal error, and the script will stop.

require_once()
The required file is called only once when a page is open and further calling of the file will be ignored.

15.     How can we extract string ‘abc.com’ from a string ‘http://info@abc.com’ using regular _expression of php?
      We can use the preg_match() function with “/.*@(.*)$/” as the regular expression pattern.
For example:
<?php
preg_match("/.*@(.*)$/","http://info@abc.com",$data);
echo $data[1];
?>