[SOLVED] Weighted Rand

[MadnessRed]

Hi I was wondering if there was already a function that did this. For example, Say I have 3 items, 1,2 and 3, and I had an array saying how much of each I had eg.

 

$items = array(1 => 75,

2 => 25,

3 => 0);

 

Then it would pick and random item, so there would be a 75% chance if picking item 1, 25% of picking an item 2 and % chance of picking an item 3.

 

I was wondering if there already was a function for this. if not I can make one myself easy enough.

[rhodesa]

i don't think there is a "weighted random" function like that...off the top of my head though, this should work:

<?php
  $items = array(
    1 => 75,
    2 => 25,
    3 => 0,
  );
  $list = array();
  foreach($items as $key => $weight){
    if($weight > 0) //Skip if there is no weight
      $list = array_merge($list,array_fill(0,$weight,$key)); //Add the entry $weight times
  }
  shuffle($list); //Randomize list
  print $list[0]; //Grab one
?>

[MadnessRed]

ok, thanks