Random Draw By Chance

[Anon]

I just wanna know how to do it.
For example, I got 3 groups of data.
Let's say the 1st group is 1 to 10,
the 2nd one is from 11 to 20 and the 3rd one is 21 to 30.

The 1st group of data has 60% by chance in random drawing, the 2nd group has 35% and the 3rd group has the rest(5%).

[polson]

Here's one way that comes to mind, should be pretty easy to follow :

<?php

srand ((double) microtime() * 1000000);

$chance = rand(0,100);

if ($chance < 61) {

$l = 1;
$h = 10;

} elseif ($chance < 96) {

$l = 11;
$h = 20;

} else {

$l = 21;
$h = 30;
}

$number = rand($l,$h);

?>

[[deleted]]

Hmm.. Now that is one elegant solution. Nice one.

But, doesn't <61 include 0 through 60.9999?
and doesn't rand(0,100) give 0 through 100 (101 whole numbers)

Then shouldn't it be

$chance = rand(1,100);

if ($chance <= 60) {

$l = 1;
$h = 10;

} elseif ($chance <= 95) {

[polson]

sound good.

I don't get paid enough to think these things through :-)

[Anon]

Is there such a thing as "getting paid enough"? 🙂

[kparker]

Sure there is--I can even remember it happening to me once or twice! :-)

[Anon]

And how can we apply for a job at your company? :-)