An example of winning probability algorithm for PHP big turntable

This article describes the example of PHP big turntable winning probability algorithm, sharing for your reference. The details are as follows:

The big turntable is an interesting thing in many online games recently. Let's take a look at the algorithm and example of winning probability of this big turntable, hoping to help you.

This is an APP client has a big turntable lottery algorithm, and how to draw the lottery is of course realized in our server. Let's briefly share the implementation code under 1:

header("Content-type: text/html; charset=utf-8");

$prize_arr = array(

'0' => array('id'=>1,'prize'=>' Tablet PC ','v'=>1),

'1' => array('id'=>2,'prize'=>' Digital camera ','v'=>5),

'2' => array('id'=>3,'prize'=>' Sound box equipment ','v'=>10),

'3' => array('id'=>4,'prize'=>'4G USB flash drive ','v'=>12),

'4' => array('id'=>5,'prize'=>'10Q Currency ','v'=>22),

'5' => array('id'=>6,'prize'=>' Maybe you can win next time ','v'=>50),

);

 

$actor = 100;

 

foreach ($prize_arr as $v) {

$arr[$v['id']] = $v['v'];

}

foreach ($arr as &$v) {

$v = $v*$actor;

}

asort($arr);

$sum = array_sum($arr);   // Total probability 

 

$rand = mt_rand(1,$sum);

 

$result = '';    // Winning product id

 

foreach ($arr as $k => $x)

{

if($rand <= $x)

{

$result = $k;

break;

}

else

{

$rand -= $x;

}

}

$res['yes'] = $prize_arr[$result-1]['prize']; // A winning prize 

print_r($res);

I hope this article is helpful to everyone's PHP programming.