PHP wechat red packet grabbing algorithm

php Wechat red packet algorithm

function qiangHongbao() {    $total=10;// Total     $num=8;//  Divide into 8 Red envelopes , Support 8 People receive at random      $min=0.01;// Everyone can at least receive 0.01 element      for ($i=1;$i<$num;$i++) {         $safe_total=($total-($num-$i)*$min)/($num-$i);// Random safety upper limit          $money=mt_rand($min*100,$safe_total*100)/100;         $total=$total-$money;         echo ' The first '.$i.' Red envelopes ：'.$money.'  element , balance ：'.$total.'  element  <br/>';     }     echo ' The first '.$num.' Red envelopes ：'.$total.'  element , balance ：0  element '; }//  Output results //  The first 1 Red envelopes ：0.08  element , balance ：9.92  element //  The first 2 Red envelopes ：0.82  element , balance ：9.1  element //  The first 3 Red envelopes ：1.4  element , balance ：7.7  element //  The first 4 Red envelopes ：0.87  element , balance ：6.83  element //  The first 5 Red envelopes ：1.07  element , balance ：5.76  element //  The first 6 Red envelopes ：2.47  element , balance ：3.29  element //  The first 7 Red envelopes ：1.01  element , balance ：2.28  element //  The first 8 Red envelopes ：2.28  element , balance ：0  element 

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