PHP Dice Roll Function Help

[Evermore]

I am not a very good PHP programmer, and I got a project to "work" on.

I need help writing a Dice Roll Function. This is how I'm supposed to do the two functions:

New Function: dice_roll (int sides)

    - $ returns a random number of how many sided the dice is, between 1 and the $.

 

New Function: dice_roll_str (string dicestr)

    - A string describing the dice [0-9] + d [0-9 ]+[+-][ 0-9] + size (d <number_of_dices> <number_of_sides> [+-][modifying_value])

    - For example if I call the function with "3d6-3", this means: we throw 3 times with a 6-sided dice, add it up, then subtract 3-t.

    - The function is to return a false value on error

    - Possible errors:

      - Minimum number of of sides of the dice is 2 the maximum is 24

      - A minimum number of dices 1 the maximum is 8

      - The result should always be a positive number, which is not greater than twice of the result we got.

 

I've already done the first function. This is my code:

function dice_roll($sides_num) {
    $rand_num = rand(1, $sides_num);
    return $rand_num;
}

I'm not sure it correct.

It is the second function that I don't know how to do. Please, if you can help I'd be really grateful. If you can please put explanations on how the code works. 

Thank you so much,

Evermore

[Muddy_Funster]

OK, firstly - the plural of dice is die 

 

Secondly - this looks more suited to the freelance section, as you are effectivly asking somone to write a self contained pice of code for you, not fix a problem with some existing code of your own. 

However, could you clear up the formaula:

"- A string describing the dice [0-9] + d [0-9 ]+[+-][ 0-9] + size (d <number_of_dices> <number_of_sides> [+-][modifying_value])"

as to what d is refferencing and what dictates the <number_of_die> and <modifying_value>?

 

And also what do you meen by

" - The result should always be a positive number, which is not greater than twice of the result we got."

[WebStyles]

Very basic example

<?php
// value for each side (using colors and the 'standard' 6 sides)
$values = array('BROWN','PINK','YELLOW','BLUE','RED','GREEN');
// random value
$number = rand(0,sizeof($values)-1);
// show result;
echo $values[$number];
?>

[Pikachu2000]

OK, firstly - the plural of dice is die 

 

Actually, dice is the plural. Die is the singular.

[AyKay47]

OK, firstly - the plural of dice is die 

 

Actually, dice is the plural. Die is the singular.

he got you there..

[WebStyles]

Actually, dice is the plural. Die is the singular.

lol

 

if you're wondering, in portuguese it's DADO and DADOS

[Pikachu2000]

Same in Spanish, IIRC.

[WebStyles]

..oh, and they all have 6 sides... never seen one with 24.

[cssfreakie]

Actually, dice is the plural. Die is the singular.

lol

 

if you're wondering, in portuguese it's DADO and DADOS

if you guys are wondering dice in Swahili is kete..

[WebStyles]

if you guys are wondering dice in Swahili is kete

 

yet nobody know what it is in Esperanto, which is supposed to be the f'ing universal language.

[Evermore]

..oh, and they all have 6 sides... never seen one with 24.

Actually, there is. Type in 24 sided dice into Google Images and they will come out.

[Muddy_Funster]

..oh, and they all have 6 sides... never seen one with 24.

You never played AD&D then ....ahh, the good old days.

[WebStyles]

had to look that up... Advanced Dungeons and Dragons? lol. Nope, never played it. Man I'm from the days of the spectrum, I used to play Chuckie Egg and Manic Miner... No dice involved, just mad skills!