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Title : Automatic banner rotation. Randomly selects a banner for display.
Categories : Graphics, PHP, Complete Programs Update Picture
Anton Olsen
Date : Jan 17th 1999
Grade : 3 of 5 (graded 10 times)
Viewed : 17638
File : No file for this code example.
Images : No Images for this code example.
Search : More code by Anton Olsen
Action : Grade This Code Example
Tools : My Examples List

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<?php
/* banner.phtml
Banner rotation script for PHP3 by Anton Olsen (aolsen@graphweb.com)
Please feel free to do with this script what you want, all I ask is
that if you make significant changes, please e-mail them to me.

I tried to use a number of different methods, the image functions
of PHP do not appear to understand animated GIFs and the file
handling features (fopen, fpassthru, and fclose) were causing
apache to crash on me. I settled on using passthru. Although
possibly not as portable, it appears to work faster than either
method mentioned above.

Assumptions:
You have a directory for all your banners.
All banners are GIF files.
The filenames of the banners all start with banner.
There are no other files in the directory starting with banner.

Installation:
Place this script in the banners directory.
Place all your banner*gif files in the same directory.
Add the following HTML code to your web pages :
<a href="wherever.you.want.com">
<img src="http://www.yourserver.com/bannerdir/banner.phtml" alt="Random Banner Here" border=0>
</a>

*/

/* random( $max integer )
Returns a random number between 0 and $max-1;
*/
function random( $max )
{
$x = rand();
$y = getrandmax();

$r = $x / $y * ($max -1 );

$r = round( $r++ );
return $r;
}

/* Read the directory, add all "banner*" files with to the array
*/
$i = 0;
$d = dir( ".");
while($entry=$d->read())
if (substr($entry,0,6) == "banner")
$array[$i++] = $entry;
$d->close();


/* pick a banner at random
*/
$r = random( $i );

/* Send a no-cache header, and the gif type header, and output the file.
*/
Header( "Pragma: no-cache" );
Header( "Expires: Monday 01-Jan-80 12:00:00 GMT" );
Header( "Content-type: image/gif");
passthru( "cat $array[$r]" );

?>



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 Vincent Kruger wrote :405
Could any one maybe modify this script to select 
random html code from a mysql database instead of 
selecting a random gif froma directory.

I have tried to modify it myself, but have no come 
through.

I off to try again !
Vince