Hey,
Have a quick question about which is better to get real random values, shuffle
or mt_rand.
I am trying to shuffle a deck of cards and reading another thread I saw that
after a couple of thousand random generations patterns have been observed using
rand()... so its better to use mt_rand().
After i wrote a function (copied below) to get real random cards from a 52
deck, Tijnema from the list kindly sent me a piece of code thats
simpler/faster/should or would use less processing and does exactly what my
function does except it uses shuffle()...
Any idea which would be better to constantly generate proper random numbers for
a long period of time?
========= My original code with mt_rand() ============
function load_cards($no_of_players)
{
$i=0;
$cards=array();
while($i<1)
{
if(empty($cards[0]))
{
$cards[]=mt_rand(1,52);
}
else
{
$no_of_cards_already_in_array=count($cards);
$cards_to_be_dealt=$no_of_players * 2;
$cards_to_be_dealt=$cards_to_be_dealt + 5;
if($no_of_cards_already_in_array < $cards_to_be_dealt)
{
$new_generated_card=mt_rand(1,52);
if(!in_array($new_generated_card,$cards))
{
$cards[]=$new_generated_card;
}
}else
{
// end the loop
$i=2;
break; // just in case the above does not break outa the loop.
}
}
}
return $cards;
}
========== Contributed code ===================
// only generating 5 numbers here
$deck=array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52);
shuffle($deck);
for($i=0; $i<5; $i++)
{
$card = array_pop($deck);
echo $card."<br>";
}
==============================================
Any comments and suggestions are also welcome.
Thanks!
Ryan
------
- The faulty interface lies between the chair and the keyboard.
- Creativity is great, but plagiarism is faster!
- Smile, everyone loves a moron. :-)
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