help with mt_rand and switch

[floorfiller]

Hello Everyone,

 

I am working on a little project, which is basically creating a lottery draft order for our fantasy football league (I know uber cool right? lol).

 

I'm basically trying to mimic the old NBA draft lottery by doing something like the following:

 

Say our league has 12 teams and I want to weight each players chance of getting that 1st pick in the draft?  

 

Well I would give the worst player 12 chances out of 78, 2nd to last 11 chances out of 78 etc.

 

So I basically created an array with values 1-78 to be my overall chances and some other arrays to assign numbers to each team member i.e. 1-12 to last place, 13-23 for send to last etc.

 

and I was planning to do a while loop and array_diff to narrow down the chances.  here is what i have thus far:

while($x <= 12){

    $num = $adjusted[mt_rand(0,count($adjusted)-1)];
    
    Switch($num){
        
        case in_array($num,$place12):
        
            echo $x + ' ' + 'Player12';
        
            $adjusted = array_diff($adjusted,$place12);
            
            $x++;
        break;
        
        case in_array($num,$place11):
        
            echo $x + ' ' + 'Player11';
        
            $adjusted = array_diff($adjusted,$place11);
        
            $x++;
        break;
        
        case in_array($num,$place10):
        
            echo $x + ' ' + 'Player10';
        
            $adjusted = array_diff($adjusted,$place10);
        
            $x++;
        break;
        
        case in_array($num,$place9):
        
            echo $x + ' ' + 'Player9';
        
            $adjusted = array_diff($adjusted,$place9);
        
            $x++;
        break;
        
        case in_array($num,$place8):
        
            echo $x + ' ' + 'Player8';
        
            $adjusted = array_diff($adjusted,$place8);
        
            $x++;
        break;
        
        case in_array($num,$place7):
        
            echo $x + ' ' + 'Player7';
        
            $adjusted = array_diff($adjusted,$place7);
        
            $x++;
        break;
        
        case in_array($num,$place6):
        
            echo $x + ' ' + 'Player6';
        
            $adjusted = array_diff($adjusted,$place6);
        
            $x++;
        break;
        
        case in_array($num,$place5):
        
            echo $x + ' ' + 'Player5';
        
            $adjusted = array_diff($adjusted,$place5);
        
            $x++;
        break;
        
        case in_array($num,$place4):
        
            echo $x + ' ' + 'Player4';
        
            $adjusted = array_diff($adjusted,$place4);
        
            $x++;
        break;
        
        case in_array($num,$place3):
        
            echo $x + ' ' + 'Player3';
        
            $adjusted = array_diff($adjusted,$place3);
        
            $x++;
        break;
        
        case in_array($num,$place2):
        
            echo $x + ' ' + 'Player2';
        
            $adjusted = array_diff($adjusted,$place2);
        
            $x++;
        break;
        
        case in_array($num,$place1):
        
            echo $x + ' ' + 'Player1';
        
            $adjusted = array_diff($adjusted,$place1);
        
            $x++;
        break;
        
        default:
        
            $adjusted = $lottery;

        break;
}               
}

Just starting out on the project so it's still pretty basic.  Just trying to work on functionality right now.  I am getting an undefined offset error which i assume is related to the way i'm doing and storing the mt_rand value.  

 

any thoughts on how i might fix it?

[Barand]

When you use switch($num) the case values should be possible values of $num

 

eg

switch ($dayOfWeek) {
  case 6:
    echo "Saturday";
    break;
  case 0:
    echo "Sunday";
    break;
  default:
    echo "Weekday";
    break;
}

Alternatively, as in_array() returns true or false, you could

switch (true) {
  case $dow == 6:
    echo "Saturday";
    break;
  case $dow == 0:
    echo "Sunday";
    break;
  default:
    echo "Weekday";
    break;
}

Also, the string concatenation operator in PHP is a period (.) and not '+'

[floorfiller]

Thanks Sen that is helpful.  I'm getting close to what I'm looking for however it doesn't appear that the while loop is working quite the way i was expecting.  

 

if you see i was hoping to remove the players chance from the next iteration of the loop and select a new random number.  I see that it keeps selecting numbers that are not in the array, which leads me to believe that it is not using the newly assigned array value correctly.  

 

any thoughts?

[Barand]

Not offhand, member.

 

I don't know what your $adjusted array looks like.

[floorfiller]

lol sorry about that Barand.

 

so for instance let's say these are the two arrays:

$adjusted = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78);

$place12 = array(1,2,3,4,5,6,7,8,9,10,11,12);

I would just want to subtract them with the array_diff function and rerun the while loop again using that new array value.  

[Barand]

Does this give what you want?

<?php
// players in order of best to worst
$players = array (
        1 => 'Player_1',
             'Player_2',
             'Player_3',
             'Player_4',
             'Player_5',
             'Player_6',
             'Player_7',
             'Player_8',
             'Player_9',
             'Player10',
             'Player11',
             'Player12',
        );
// put player12 into an array 12 times, player11 11 times etc
$adjusted = array();
foreach ($players as $k=>$p) {
    $tmp = array_fill(0,$k,$p);
    $adjusted = array_merge($adjusted, $tmp);
}
shuffle($adjusted);
$adj = array_unique($adjusted);
echo '<pre>',print_r($adj, true),'</pre>';

?>

[floorfiller]

thanks again Barand.  I ended up doing something a little different, but your post definitely pointed me in the right direction.