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php实现按照权重随机排序数据的方法

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Release: 2016-06-06 20:14:29
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这篇文章主要介绍了php实现按照权重随机排序数据的方法,是php数据排序中一个比较典型的应用技巧,需要的朋友可以参考下

本文实例讲述了php实现按照权重随机排序数据的方法。分享给大家供大家参考。

具体实现方法如下:

复制代码 代码如下:


/** 
 * @param array $weight 权重  例如array('a'=>10,'b'=>20,'c'=>50) 
 * @return string key   键名  
 */ 
function roll($weight = array()) {  
 $roll = rand ( 1, array_sum ( $weight ) );  
 $_tmpW = 0;  
 $rollnum = 0;  
  foreach ( $weight as $k => $v ) {  
  $min = $_tmpW;  
   $_tmpW += $v;  
   $max = $_tmpW;  
   if ($roll > $min && $roll     $rollnum = $k;  
    break;  
   }  
 }  
  return $rollnum;  
}  
 
$row=roll(array('a'=>10,'b'=>20,'c'=>50));  
echo $row;  
?>

希望本文所述对大家的php程序设计有所帮助。

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