View Full Version : saving mysql order number

arne2

08-26-2006, 10:02 AM

HI,

i have created a script that randomly creates endtimes (of a race).

So like this :

$endtime1=mt_rand(1,5);

and so on for 5times (so till $endtime5).

Endtime1 is the endtime of horse nr 1

Endtime2....................................2,...

The endtimes are written in the database in the table 'horsescores'.

(id(auto_increment),horsenr,endtime,rank).

In horsenr the number of the horse (1-5)is written. In the endtime column the endtimes are written.

I now want to write the rank (depending on the endtimes, so the horse with the smallest endtime is the winner, etcetc untill the loser (5th).

How can i do this?

I thought about selecting all horses and order them by endtime with an sql query but i don't exactly now how i can save that ordering in ranknumbers.

And maybe there is a better way?

Thank you for you help

the endtime and rank are the same piece of information, why do you need to store it twice?

arne2

08-26-2006, 10:19 AM

because i want to make the game look real by adding an endtime into the scorebord.

But you're probably right and think i just realized what you mean.

Can i (on the scorebord), order them by endtime ASC and adding the corresponding rank in the 'rank' column?

How?

With an $i ?

And when it starts $i = 1 (so first), and use a while loop with $i++ everytime?

arne2

08-26-2006, 11:34 AM

cool ! I'll try it now !

About the mt_rand

is there a way to use decimal numbers, for example an mt_rand between 9,11 and 12,23?

Mwnciau

08-26-2006, 02:15 PM

I dont think so... you could do :

$whole = mt_rand(10, 20);

$dec = mt_rand(0, 99);

$number = $whole . '.' . $dec;

Mwnciau

08-26-2006, 02:24 PM

extending that:

function my_rand_dec($min, $max){

list ($minwhole, $mindec) = explode('.', $min, 2);

list ($maxwhole, $maxdec) = explode('.', $max, 2);

$whole = mt_rand($minwhole, $maxwhole);

$dec = mt_rand($mindec, $maxdec);

return $whole . '.' . $dec;

}

arne2

08-27-2006, 11:19 AM

thank you very much :):thumbsup:

marek_mar

08-27-2006, 04:07 PM

extending that:

function my_rand_dec($min, $max){

list ($minwhole, $mindec) = explode('.', $min, 2);

list ($maxwhole, $maxdec) = explode('.', $max, 2);

$whole = mt_rand($minwhole, $maxwhole);

$dec = mt_rand($mindec, $maxdec);

return $whole . '.' . $dec;

}

The decimal restrictions should only apply when the random number is either $minwhole or $maxwhole. When called with for ex. 20.8 and 30.9 you won't get a 25.1

Mwnciau

08-27-2006, 04:19 PM

ah yes... i see my flaw... but it will probably work for what he wants.

marek_mar

08-27-2006, 05:57 PM

How about like this:

<?php

function float_mt_rand($min, $max)

{

$i = 0;

$j = 0;

while((int) $min != (float) $min)

{

$min *= 10;

$i++;

}

while((int) $max != (float) $max)

{

$max *= 10;

$j++;

}

$i = max($i, $j);

return mt_rand($min, $max) / pow(10, $i);

}

var_dump(float_mt_rand(1.244, 93.1));

?>

The only flaw is that the numbers can't get too long unless yoy will use BCMath or GMP.

arne2

08-27-2006, 06:23 PM

Hi Mwnciau & marek_mar

thank you both for your efforts in helping me :)

About your code, Mwnciau, when i tried it it only returned decimal numbers of .0 and .1 so( 174.1,154.1,4564.1:456465.1,......)

so that's not really what i wanted.

About your code marek_mar, seems to work perfectly random, but it prints float() and int() with it, can you delete that? Thank you (because i just want to store the value in a variable like for example $randnr=float_mt_rand(min,max); for that it should only be a number right? (sorry i'm a total noob :p)

Also about your code marek_mar, when i tried it (with your example numbers of min and max), i almost all the time gotnumbers 0,985 and 1,6 and never like 13.2. Why? (i don't understand your function :p).

Also : i should have numbers varying between 9.12 and 14.1, should i just enter that numbers in the min and max?

THANK YOU BOTH AGAIN!

marek_mar

08-27-2006, 07:44 PM

About your code marek_mar, seems to work perfectly random, but it prints float() and int() with it, can you delete that? Thank you (because i just want to store the value in a variable like for example $randnr=float_mt_rand(min,max); for that it should only be a number right? (sorry i'm a total noob :p)

Yes, the int/float is from var_dump(). It is useful to know which type a variable has sometimes and that's why I use it.

Also about your code marek_mar, when i tried it (with your example numbers of min and max), i almost all the time gotnumbers 0,985 and 1,6 and never like 13.2. Why? (i don't understand your function :p).

I'm sorry this is a bug. This is version is corrected.

<?php

function float_mt_rand($min, $max)

{

$i = 0;

while((int) $min != (float) $min || (int) $max != (float) $max)

{

$min *= 10;

$max *= 10;

$i++;

}

return mt_rand($min, $max) / pow(10, $i);

}

var_dump(float_mt_rand(1.244, 93.1));

?>

thunderhoster

08-27-2006, 07:46 PM

This is not the best way to solve your problem (it can occasionally cause some delay) but the quickest:

<?php

function my_rand_dec($min, $max){

$whole = 0;

$dec = 0;

$maxwhole = explode('.', $max, 2);

$maxwhole = $maxwhole[0];

$minwhole = explode('.', $min, 2);

$minwhole = $minwhole[0];

while (($whole . '.' . $dec) == 0 || ($whole . '.' . $dec) > $max || ($whole . '.' . $dec) < $min) {

$whole = mt_rand($minwhole, $maxwhole);

$dec = mt_rand(0, 99);

}

return $whole . '.' . $dec;

}

?>

arne2

08-29-2006, 11:07 AM

thank you both i'm going to test it right away !

Could anyone of you comment your code because i tried but i can't really figure out what everything means.

arne2

08-29-2006, 12:03 PM

great ! It's working, thank you !

arne2

08-29-2006, 12:14 PM

Oops, noticed one small problem, how can i make sure none of the endtime's are the same (because then ranks should be the same too).

I've put the float_mt_rand function in 5variables called

$endtime1,

$endtime2,..

how can i make sure none of the $endtime's are the same?

THANK YOU VERY MUCH !!

marek_mar

08-29-2006, 03:27 PM

thank you both i'm going to test it right away !

Could anyone of you comment your code because i tried but i can't really figure out what everything means.

Mine just multiplies $min and $max by 10 untill both numbers are integers and uses them for mt_rand(). Then it divides the value by a power of 10 equal to the number of times $min and $max was multiplied by 10 before.

marek_mar

08-29-2006, 03:30 PM

You can generate the times so that the $min for the next random time is the time of the next fastest horse.

Mwnciau

08-29-2006, 03:35 PM

$endtime[] = float_mt_rand();

$endtime[] = float_mt_rand();

$endtime[] = float_mt_rand();

$endtime[] = float_mt_rand();

$endtime[] = float_mt_rand();

for($a = 0; $a < 5; $a++){

$b = 0;

$c = $a + 1;

while ($b < 5){

while ($endtime[$a] == $endtime[$c]){

$endtime[$a] = float_mt_rand();

}

$c = ($c == 5) ? 0 : $c + 1;

$b++;

}

}

That will do somechecking but wont be perfect... not even sure that will work :p

arne2

08-29-2006, 03:36 PM

i don't want to change anything about the $min and $max during the execution of the function.

I ONLy want them to be all different.

Any idea?

THANKS FOR EXPLAINING AND HELPING ME !

arne2

08-29-2006, 03:37 PM

mwnciau thank you for your response, but are you sure all endtimes are checked that way?

Mwnciau

08-29-2006, 03:55 PM

Yes, I'm pretty sure they are all tested but there is a possibility that the new ones will be the same (a lot less chance though I think).

Mwnciau

08-29-2006, 04:10 PM

How are you putting them into the database, is it a new row for each result? (ie. row for result1, and row for result2

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