I want to show in random way 8 pictures (jpg) from a collection of 20 I have
, so the users have more interest to visit the page.
I use the follow small code with the help from the manual:
But the random numbers are all accending order for 1 -> 20 and in cycle, as
the seed comes from computers timming.
So I get always the same sets of 8 numbers. (i.e. 1->8, 3->10,
15-16-17-18-19-20-1-2 ecc)
What can I use for seed for *real* rnd?
(I FOUND IT, I CHANGED 100000 to 10000000 AND IT WORKS!)
Thanks - ******** PLEASE DON'T ANSWER!!! ******
Makis Savaidis
======= the code ==>
<?php
// seed with microseconds
function make_seed() {
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
// create 8 random numbers for 8 pictures - not doubles
$arr = array ();
$cnt2=0;
do // 8 times
{
do // produce rnd number
{
$cnt=1; $break=0;
srand(make_seed());
$randval1 = rand(1,20); // for a palette of 20 pictures
echo (" rnd = $randval1 <BR> ");
for ($cnt1=1; $cnt1<=$cnt2; $cnt1++) // check for doubles
{
if ($arr[$cnt1]==$randval1) $break=1;
}
} while ($break==1);
$cnt2++; $arr[$cnt2] = $randval1;
echo(" cnt2 $cnt2 arr1 $arr[$cnt2] <BR> ");
} while ($cnt2<8);
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