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Posted by Geoff Berrow on 03/03/07 10:21
Message-ID: <fjohu29bo3enigbupm4npjmino161i2g86@4ax.com> from Fred
Atkinson contained the following:
> I'll look your coding over. Maybe I can figure it out well
>enough to code it into my page. .
If the data is structured in an organised way it will be easier to
extract in the way you want (even if that way is random).
Getting a random number $z (let's not get into a discussion about true
randomness kiddies) is easy. Say you wanted a random number between $x
and $y. You just do $z=rand($x,$y);
Now you can see that if images are coded with a sequential number as the
name it would be easy to do
<img src="image<?php echo $z;?> alt="">
However, chances are they won't be. Arrays however, can have numeric
keys.
So if you have an array like this
$array[]=cat.jpg;
$array[]=dog.jpg;
$array[]=fish.jpg;
$array[]=goat.jpg;
PHP will assign numeric keys to the array, starting at zero
The number of keys is derived from count($array). So the last key is
Applying that to the above we get
$z=rand(0,(count($array)-1));
(aside - I know about shuffle folks - this is easier to explain)
and you output it like this
<img src="image<?php echo $array[$z];?> alt="">
Now your only problem is getting the contents of a given directory into
an array. For this you have to loop through the contents of a directory
to find all the image files and assign them to the array.
See my gallery script for an idea of how this is done
www.walkingoutdoors.co.uk/Geoff/gallery/gallery.zip
example:
http://www.walkingoutdoors.co.uk/Geoff/tryfan/
--
Geoff Berrow 0110001001101100010000000110
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