percentages in PHP

[Chris H]

I am wanting to write a function for a poker league manager that will
detrmine players finishing points in a tournament depending on the amount of
players that played... In other words when the tournament director enters
the tournament results into the database, he will enter the number of
players that played and then upon submissin this funtion will takek that
number and if it is in certain ranges will then know which payout structure
to use... for example...

If the total players were 25, then it would determine that for this amount
of players only the top 10 places will get points, and then will use a pre
determined "chart" of percentages and then calculate the players points..

i.e the charts or database would be something like.. and there would have to
be diffrent tables for each players registered range

PLAYER RANGE = 1-10
RANK | PAYOUT PERCENTAGE
=============== =============== ==========
1 | 70%
2 | 20%
3 | 10%
etc etc


Now I have a basic idea of how to get this function to do the majority of
what i need, except I do not know how to make it calculate the points from
percentages and (also all final points have to be rounded up/down)

in other words what is the correct format for this type of equation.

$prize_pool = "5000";
$total_points = 70% of $prize_pool


Also any other suggestions you may have id be glad to hear.

[Michael Pichler]

Re: percentages in PHP

Chris H schrieb:
[...][color=blue]
> in other words what is the correct format for this type of equation.
>
> $prize_pool = "5000";
> $total_points = 70% of $prize_pool
>[/color]

I'm not sure if I understood your problem.

<?
$total_points = (int) $prize_pool * 0.7;
// if needed
$total_points = round($total_po ints);
?>

Can it be that simple?

Michael

[Chris H]

Re: percentages in PHP

i knew it was something simple liek that, damm brain farts... for some
reason my basic math skills escaped me and i forgot how to convert the %
into a usable number by php.. i.e using decimal places... i didnt know about
the round() function though, yet another one of the many functions i have
yet to come across..

Anyway.. thanks michael for your quick reply


"Michael Pichler" <mail@michaelpi chler.de> wrote in message
news:e102a4$pci $01$1@news.t-online.com...[color=blue]
> Chris H schrieb:
> [...][color=green]
>> in other words what is the correct format for this type of equation.
>>
>> $prize_pool = "5000";
>> $total_points = 70% of $prize_pool
>>[/color]
>
> I'm not sure if I understood your problem.
>
> <?
> $total_points = (int) $prize_pool * 0.7;
> // if needed
> $total_points = round($total_po ints);
> ?>
>
> Can it be that simple?
>
> Michael
>
>[/color]

[Chris H]

Re: percentages in PHP

What does (int) do? I recognize it as something to do with "integer". but im
not sure what exactly the purpose is of the (int) is

<?
$total_points = (int) $prize_pool * 0.7;
// if needed
$total_points = round($total_po ints);
?>


"Michael Pichler" <mail@michaelpi chler.de> wrote in message
news:e102a4$pci $01$1@news.t-online.com...[color=blue]
> Chris H schrieb:
> [...][color=green]
>> in other words what is the correct format for this type of equation.
>>
>> $prize_pool = "5000";
>> $total_points = 70% of $prize_pool
>>[/color]
>
> I'm not sure if I understood your problem.
>
> <?
> $total_points = (int) $prize_pool * 0.7;
> // if needed
> $total_points = round($total_po ints);
> ?>
>
> Can it be that simple?
>
> Michael
>
>[/color]

[Geoff Berrow]

Re: percentages in PHP

Message-ID: <bUUYf.878243$x 96.643349@attbi _s72> from Chris H contained
the following:
[color=blue]
>What does (int) do? I recognize it as something to do with "integer". but im
>not sure what exactly the purpose is of the (int) is[/color]

http://uk2.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting

That said, I don't really know why it's there. The result of dividing
something by 0.7 is quite likely to be something other than an integer.

There is even a warning about it

http://uk2.php.net/manual/en/language.types.integer.php#language.types.integer.casting

--
Geoff Berrow 011000100110110 0010000000110
001101101011011 001000110111101 100111001011
100110001101101 111001011100111 010101101011

[Kim André Akerø]

Re: percentages in PHP

Chris H wrote:
[color=blue]
> "Michael Pichler" <mail@michaelpi chler.de> wrote in message
> news:e102a4$pci $01$1@news.t-online.com...[color=green]
> > Chris H schrieb:
> > [...][color=darkred]
> > > in other words what is the correct format for this type of
> > > equation.
> > >
> > > $prize_pool = "5000";
> > > $total_points = 70% of $prize_pool[/color]
> >
> > I'm not sure if I understood your problem.
> >
> > <?
> > $total_points = (int) $prize_pool * 0.7;
> > // if needed
> > $total_points = round($total_po ints);
> > ?>
> >
> > Can it be that simple?
> >[/color]
> What does (int) do? I recognize it as something to do with "integer".
> but im not sure what exactly the purpose is of the (int) is
>
> <?
> $total_points = (int) $prize_pool * 0.7;
> // if needed
> $total_points = round($total_po ints);
> ?>[/color]

It converts the resulting float to an integer:

http://php.net/language.types.integer#language.types.integer.casting

--
Kim André Akerø
- kimandre@NOSPAM betadome.com
(remove NOSPAM to contact me directly)