Home > php教程 > php手册 > body text

php实现按照权重随机排序数据的方法,php实现排序

WBOY
Release: 2016-06-13 09:17:08
Original
1573 people have browsed it

php实现按照权重随机排序数据的方法,php实现排序

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。

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!