Winning probability algorithm (php can be used for lottery algorithms such as scratch cards and big turntable)

: This article mainly introduces the winning probability algorithm (php can be used for scratch cards, big turntable, and other lottery algorithms). If you are interested in PHP tutorials, you can refer to it. The php winning probability algorithm can be used to draw lottery algorithms such as scratch cards and big turntable. The usage is very simple. the code has a detailed description, which can be understood at a glance.

 $ ProCur) {$ randNum = mt_rand (1, $ proSum); if ($ randNum <= $ proCur) {$ result = $ key; break ;} else {$ proSum-= $ proCur ;}} unset ($ proArr); return $ result;}/** award array * is a two-dimensional array, all prize information for this lottery is recorded. * The id indicates the prize level, the prize indicates the prize, and the v indicates the probability of the prize. * Note that the value of v must be an integer. you can set the value of v for the corresponding award to 0, which means that the percentage of the award is 0, * The sum (base number) of values in the array. the larger the base number, the more accurate the probability is. * In this example, the sum of v is 100, and the probability of winning a tablet is 1%. * If the sum of v is 10000, the probability of winning a tablet is one in ten. **/$ Prize_arr = array ('0' => array ('id' => 1, 'prize' => 'tablet ', 'V' => 1 ), '1' => array ('id' => 2, 'prize' => 'digital camera ', 'V' => 5 ), '2' => array ('id' => 3, 'prize' => 'Speaker device', 'V' => 10 ), '3' => array ('id' => 4, 'prize' => '4G disks', 'V' => 12 ), '4' => array ('id' => 5, 'prize' => '10q coin ', 'V' => 22 ), '5' => array ('id' => 6, 'prize' => 'next time you may be able to get in,', 'V' => 50 ),); /** for each request on the front-end page, PHP loop Awards are set as an array. * The probability calculation function get_rand is used to obtain the prize id. * Save the prize to the array $ res ['yes'], and * save the remaining unwon information in $ res ['no, * output the json data count to the front-end page. */Foreach ($ prize_arras $ key => $ val) {$ arr [$ val ['id'] = $ val ['V'];} $ rid = get_rand ($ arr); // Obtain the award id based on the probability $ res ['yes'] = $ prize_arr [$ rid-1] ['prize']; // Medium Award unset ($ prize_arr [$ rid-1]); // removes the Medium Award from the array, and the remaining unmiddle award shuffle ($ prize_arr ); // disrupt the array order for ($ I = 0; $ I
 
  
                                                
  
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