年会抽奖,要求一等奖的中奖概率是0.12%,二等奖中奖概率是3%,三等奖中奖概率是12%,其他中奖概率是都是谢谢惠顾。
1 <?php 2 /** 3 * 抽奖 4 * @param int $total 5 */ 6 function getReward($total=1000) 7 { 8 $win1 = floor((0.12*$total)/100); 9 $win2 = floor((3*$total)/100); 10 $win3 = floor((12*$total)/100); 11 $other = $total-$win1-$win2-$win3; 12 $return = array(); 13 for ($i=0;$i<$win1;$i++) 14 { 15 $return[] = 1; 16 } 17 for ($j=0;$j<$win2;$j++) 18 { 19 $return[] = 2; 20 } 21 for ($m=0;$m<$win3;$m++) 22 { 23 $return[] = 3; 24 } 25 for ($n=0;$n<$other;$n++) 26 { 27 $return[] = ‘谢谢惠顾‘; 28 } 29 shuffle($return); 30 return $return[array_rand($return)]; 31 } 32 33 $data = getReward(); 34 echo $data; 35 ?>
时间: 2024-10-09 23:04:24