----- Original Message -----
From: <tg-php@xxxxxxxxxxxxxxxxxxxxxx>
To: <php-general@xxxxxxxxxxxxx>
Cc: <info@xxxxxxxxxxx>
Sent: Sunday, December 03, 2006 11:52 PM
Subject: Re: Random pictures - not twice
Without using cookies or session information, you're going to go through
your picture list faster depending on how many users are accessing the
random pic page. If you don't make it user-specific, then it doesn't
really matter if you go through the images sequentially.. it may appear
random on the user end because other users are going to be grabbing
sequential pics as well.
If you want to stir the waters a bit, you could run them sequentially but
randomize the sequence. This is what some music playlist programs do when
you randomize a playlist. Instead of pulling a random song from the list
and risking playing the same song back to back, it just shuffles the
playlist and plays it sequentially. When you get to the end of your
randomized list, you can re-shuffle it and start over. This gives some
semblance of randomness.
If you want to make sure each image gets its fair amount of time in the
spotlight, you could keep track of how many times each image has been
displayed. Having a database table with a list of all the image names and
their 'served' count would let you weight your list a bit to give
preference to the images that havn't been displayed that often.
And if you want to give each user the total package, you can keep track of
how many times each image was served to a specific user and weight your
shuffling that way.
I'm sure there are other ways, but there are just a few that may be viable
for you, depending on the level of randomness per user you need.
Let us know what solution you come up with. I'm sure others have had
similar questions and just havn't asked.
-TG
= = = Original message = = =
Hi there!
I have created a script the generates random pictures...
<?php
//Random pictures
//
$pictures[0] = "bil1.gif";
$pictures[1] = "bil2.gif";
$pictures[2] = "bil3.gif";
$pictures[3] = "bil4.gif";
for ($i=0;$i<3;$i++)
$r = rand(0,3);
?>
<p> <img src="<?php echo $pictures[$r];?>"></p>
<?php
?>
With this above script the same picture can be shown twice. Is there any
smart way of avoiding this without having to rely on cookies/sessionids?
Best regards
/Gustav Wiberg
Stammis Internet - http://www.stammis.com/ - pedigrees on the net
___________________________________________________________
Sent by ePrompter, the premier email notification software.
Free download at http://www.ePrompter.com.
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Hi again!
I've solved it with array_rand. It wasn't that hard at all, just had to know
which function to use! :-)
code:
<?php
//Random pictures
//
$pictures[0] = "bil1.gif";
$pictures[1] = "bil2.gif";
$pictures[2] = "bil3.gif";
$pictures[3] = "bil4.gif";
$randomNr = array_rand($pictures, count($pictures));
$occurences = 3;
for ($i=0;$i<$occurences;$i++) {
?>
<img src="<?php echo $pictures[$randomNr[$i]];?>">
<?php
}
?>
Best regards
/Gustav Wiberg
Stammis Internet - http://www.stammis.com/ - pedigrees on the net
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
