PHP implementation Carousel Lottery algorithm share PHP instance

This article is mainly for you to introduce the PHP implementation of the large turntable lottery algorithm, with a certain reference value, interested in small partners can refer to

The example of this article for everyone to share the PHP implementation of the Dial Lottery algorithm specific code for your reference, the specific content as follows

Process:

1. Assembling the prize array

2. Calculate probability

3. Return to the winning situation

The code is as follows:

The probability of winning ' V ' can be set in the background, passed to this method, note the integer

function Get_gift () {//Assembled award array//Prize ID, Prize, probability $prize _arr = Array (' 0 ' = = Array (' ID ' =>1, ' prize ' = ' flat Board pc ', ' V ' =>0), ' 1 ' = = Array (' ID ' =>2, ' prize ' = ' digital camera ', ' V ' =>0), ' 2 ' = = Array (' ID ' =>3, ' prize ' = > ' Speaker device ', ' V ' =>0, ' 3 ' = = Array (' ID ' =>4, ' prize ' = ' 4G ', ' V ' =>5), ' 4 ' = = Array (' ID ' =>5, ' p      Rize ' = ' 10Q ', ' V ' =>0), ' 5 ' = = Array (' ID ' =>6, ' prize ' + ' void Award ', ' V ' =>5),); foreach ($prize _arr as $key = + $val) {$arr [$val [' id ']] = $val [' V '];//probability array} $rid = $this->get_rand ( $arr); Get the prize ID $res by probability [' yes '] = $prize _arr[$rid -1][' Prize '); Medium Prize unset ($prize _arr[$rid-1]); The prize is excluded from the array and the remaining awards are shuffle ($prize _arr); Scrambled array order for ($i =0; $i <count ($prize _arr); $i + +) {$PR [] = $prize _arr[$i] [' Prize '];//Not in the prize array} $res [' No '     ] = $PR;         Var_dump ($res);       if ($res [' Yes ']!= ' empty prize ') {$result [' status ']=1;     $result [' name ']= $res [' yes ']; }else{$result [' status ']=-1;     $result [' msg ']= $res [' yes '];     }//return $result;  Var_dump ($result);     }//Calculate the probability of winning function Get_rand ($PROARR) {$result = ';     The total probability accuracy of the probability array $proSum = Array_sum ($PROARR);   Var_dump ($proSum); Probability array loop foreach ($proArr as $key + = $proCur) {$randNum = Mt_rand (1, $proSum);//Return random integer if ($randNum <       = $proCur) {$result = $key;      Break      } else {$proSum-= $proCur;     }} unset ($PROARR);    return $result; }

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