Problem with random array

[noone]

hello all.
I am using this code to randomly select one value from an array.

srand ();
$rec = array("1","2"," 3","4","5","6") ;
$rec = $rec[rand(0,count($r ec))];
print $rec;

problem is, is sometimes it returns nothing. can anyone see how
to make this so it always selects something.

thanks.

[Sami Haaramo]

Re: Problem with random array

noone wrote:[color=blue]
> hello all.
> I am using this code to randomly select one value from an array.
>
> srand ();
> $rec = array("1","2"," 3","4","5","6") ;
> $rec = $rec[rand(0,count($r ec))];
> print $rec;
>
> problem is, is sometimes it returns nothing. can anyone see how
> to make this so it always selects something.
>
> thanks.[/color]

Try $rec = $rec[rand(0,count($r ec)-1)];

-Sami

[Tyrone Slothrop]

Re: Problem with random array

On Fri, 27 Jun 2003 16:25:52 -0800, "noone" <noone@nowhere. com> wrote:
[color=blue]
>hello all.
>I am using this code to randomly select one value from an array.
>
>srand ();
>$rec = array("1","2"," 3","4","5","6") ;
>$rec = $rec[rand(0,count($r ec))];
>print $rec;
>
>problem is, is sometimes it returns nothing. can anyone see how
>to make this so it always selects something.
>
>thanks.[/color]

How about a do... while statement?

do {
$rec = $rec[rand(0,count($r ec))];
} while ($rec = "");

[KIPAX]

Re: Problem with random array

On Fri, 27 Jun 2003 16:25:52 -0800, "noone" <noone@nowhere. com> wrote:
[color=blue]
>hello all.
>I am using this code to randomly select one value from an array.
>
>srand ();
>$rec = array("1","2"," 3","4","5","6") ;
>$rec = $rec[rand(0,count($r ec))];
>print $rec;
>
>problem is, is sometimes it returns nothing. can anyone see how
>to make this so it always selects something.[/color]


count($rec) returns 6 because there are 6 elements

rand(0,count($r ec)) starts from 0 to count($rec) ie 6
0,1,2,3,4,5,6 is 7 elements.. and you only have 6 :)




--
KIPAX (www.kipax.com)

[Nobody]

Re: Problem with random array

Actually, the problem is that you are asking for a random number between 0
and 6. That's 7 possibilities. So one in seven times will reference an
array element that does not exist.

$rec = $rec[rand(0,count($r ec))];

should be:

$rec = $rec[rand(0,count($r ec)-1)];

Jerry




"Tyrone Slothrop" <ts@paranoids.c om> wrote in message
news:fkopfv03c8 tqbpntco2uoc96h 8003usajl@4ax.c om...[color=blue]
> On Fri, 27 Jun 2003 16:25:52 -0800, "noone" <noone@nowhere. com> wrote:
>[color=green]
> >hello all.
> >I am using this code to randomly select one value from an array.
> >
> >srand ();
> >$rec = array("1","2"," 3","4","5","6") ;
> >$rec = $rec[rand(0,count($r ec))];
> >print $rec;
> >
> >problem is, is sometimes it returns nothing. can anyone see how
> >to make this so it always selects something.
> >
> >thanks.[/color]
>
> How about a do... while statement?
>
> do {
> $rec = $rec[rand(0,count($r ec))];
> } while ($rec = "");
>[/color]