IGNOU BCA MCA Students - VIVA Question Answer for PHP Part IV

IGNOU BCA MCA Students - VIVA Question Answer for PHP

PHP Selected Question Answer - PART IV

1.  How to create a text file in php?

$filename = "/home/user/guest/newfile.txt";
$file = fopen( $filename, "w" );
if( $file == false )
{
echo ( "Error in opening new file" ); exit();
}
fwrite( $file, "This is a simple test\n" );
fclose( $file );

2.  How to strip whitespace (or other characters) from the beginning and end of a string ?

The trim() function removes whitespaces or other predefined characters from both sides of a string.

3.  What is the use of header() function in php ?

The header() function sends a raw HTTP header to a client browser.Remember that this function must be called before sending the actual out put.For example, You do not print any HTML element before using this function.

4.  How to redirect a page in php?

The following code can be used for 

it, header("Location:index.php");

5.  How stop the execution of a php scrip ?

exit() function is used to stop the execution of a page

6.  How to set a page as a home page in a php based site ?

index.php is the default name of the home page in php based sites

7.  How to find the length of a string?

strlen() function used to find the length of a string

8.  what is the use of rand() in php?

It is used to generate random numbers.If called without the arguments it returns a pseudo-random integer between 0 and getrandmax(). If you want a random number between 6 and 12 (inclusive), for example, use rand(6, 12).This function does not generate cryptographically safe values, and should not be used for cryptographic uses. If you want a cryptographically secure value, consider using openssl_random_pseudo_bytes() instead.

9.  what is the use of isset() in php?

This function is used to determine if a variable is set and is not NULL

10.               What is the difference between mysql_fetch_array() and mysql_fetch_assoc() ?

mysql_fetch_assoc function Fetch a result row as an associative array, Whilemysql_fetch_array() fetches an associative array, a numeric array, or both

11.               What is mean by an associative array?

Associative arrays are arrays that use string keys is called associative arrays.

12.               What is the importance of "method" attribute in a html form?

"method" attribute determines how to send the form-data into the server.There are two methods, get and post. The default method is get.This sends the form information by appending it on the URL.Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.