PHP lottery probability algorithm implementation code

Implementation code:

<?php
/**
 *php 中奖概率算法
 *
 */
function get_zj( $jp ,$glname = &#39;gl&#39;){
    $sum = 0;
    foreach($jp as $k =>$v ){
        $sum += $v[$glname];
    }
  
    $R = rand(1,$sum);//获取随机数
  
    foreach( $jp as $k => $v){
        if( $R <= $v[$glname] ){
            return $v;
        }
        $R = $R - $v[$glname] ;
    }
  
}
  
  
//使用方法
//模拟一个从数据库中读取的 中奖配置  gl 为 中奖的概率 
//例如array( &#39;gl&#39; => 10 , &#39;title&#39; => &#39;一等奖&#39;);的中奖概率 = 10 / （10+20+30+40）
$jp = array();
$jp[] = array( &#39;gl&#39; => 10 , &#39;title&#39; => &#39;一等奖&#39;);
$jp[] = array( &#39;gl&#39; => 20 , &#39;title&#39; => &#39;二等奖&#39;);
$jp[] = array( &#39;gl&#39; => 30 , &#39;title&#39; => &#39;三等奖&#39;);
$jp[] = array( &#39;gl&#39; => 40 , &#39;title&#39; => &#39;未中奖&#39;);
  
  
//调用 中奖概率函数 
//返回中奖 信息数组 例如：array( &#39;gl&#39; => 10 , &#39;title&#39; => &#39;一等奖&#39;);
$zj = get_zj( $jp );
  
//输出数组
var_dump($zj);

Usage method
Simulate a winning configuration gl read from the database as the probability of winning
For example array('gl' => 10, 'title' => 'First Prize'); probability of winning = 10 / (10+20+30+40)
$jp = array();
$jp[] = array( 'gl' => ; 10 , 'title' => 'First Prize');
$jp[] = array( 'gl' => 20 , 'title' => 'Second Prize');
$jp[] = array( 'gl' => 30 , 'title' => 'Third Prize');
$jp[] = array( 'gl' => 40 , 'title' = > 'Not winning');

Call the winning probability function
Return the winning information array. For example: array('gl' => 10, 'title' => 'First prize');

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