I could be wrong in thinking this, but wasn't the purpose of the presented
function to shuffle a deck in a deliberately imperfecatly random way? ie.
mimicking a human shuffler.... beats why one would want to do this as an
academic excersize, but hey, I like it ;-)
----- Original Message -----
From: "Richard Lynch" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, August 19, 2001 9:45 PM
Subject: [PHP] Re: Shuffle Cards Function
> http://php.net/shuffle will be much faster and just as random...
>
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> ----- Original Message -----
> From: Robert Schultz <[EMAIL PROTECTED]>
> Newsgroups: php.general
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, August 18, 2001 11:37 PM
> Subject: Shuffle Cards Function
>
>
> > I've written a ShuffleCards function that will actually shuffle a deck
of
> > cards just like would happen in real life (divide the deck in half and
> stick
> > them into each other with 1-3 cards between each other card)
> >
> > function ShuffleCards(&$cardsArray, $times)
> > {
> > // Randomizes where to split within center (-3 to +3 from dead
center)
> > (MINIMUM 10 CARDS IN DECK)
> > // Splits into two array. Randomizes how many cards from left and
how
> > many cards from right (between 1 and 3)
> > // Alternates sides. Continues until both arrays are empty.
> > $arraySize = count($cardsArray);
> >
> > if($arraySize<10)
> > return;
> >
> > $deadCenter = $arraySize/2;
> >
> > for($i=0;$i<$times;$i++)
> > {
> > reset($cardsArray);
> >
> > $cutVariant = rand(-3, 3);
> > $cutLocation = $deadCenter+$cutVariant;
> >
> > $firstArray = array();
> > $secondArray = array();
> >
> > for($z=0;$z<$arraySize;$z++)
> > {
> > if($z<$cutLocation)
> > array_push($firstArray, $cardsArray[$z]);
> > else
> > array_push($secondArray, $cardsArray[$z]);
> > }
> >
> > $bottomFirst = rand(0, 1);
> > $cardsArray = array();
> >
> > while(count($firstArray) && count($secondArray))
> > {
> > $leftNewCards = array();
> > $rightNewCards = array();
> >
> > $leftVariant = rand(1, 3);
> > if($leftVariant>count($firstArray))
> > $leftVariant = count($firstArray);
> >
> > $rightVariant = rand(1, 3);
> > if($rightVariant>count($secondArray))
> > $rightVariant = count($secondArray);
> >
> >
> > for($x=0;$x<$leftVariant;$x++)
> > {
> > array_push($leftNewCards, array_shift($firstArray));
> > }
> >
> > for($y=0;$y<$rightVariant;$y++)
> > {
> > array_push($rightNewCards, array_shift($secondArray));
> > }
> >
> > if($bottomFirst==0)
> > {
> > $newCardsArray = array_merge($leftNewCards, $rightNewCards);
> > $bottomFirst = 1;
> > }
> > else
> > {
> > $newCardsArray = array_merge($rightNewCards, $leftNewCards);
> > $bottomFirst = 0;
> > }
> >
> > reset($newCardsArray);
> >
> > while(count($newCardsArray))
> > {
> > array_push($cardsArray, array_shift($newCardsArray));
> > }
> > }
> >
> > if(count($firstArray))
> > {
> > while(count($firstArray))
> > array_push($cardsArray, array_shift($firstArray));
> > }
> > if(count($secondArray))
> > {
> > while(count($secondArray))
> > array_push($cardsArray, array_shift($secondArray));
> > }
> > }
> > }
> >
> > Robert Schultz - [EMAIL PROTECTED]
> >
> >
> >
>
>
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