PHP Interview Question and Answers

11. 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.
 
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12. What type of headers that PHP supports?
  $_SERVER[‘HTTP_ACCEPT’]
 
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13. 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];
?>
 
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14. How can we create a database using php?
  mysql_create_db();
 
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15. 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.
 
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