php按照权重随机排序数据的例子

作者：袖梨 2022-06-24

例子

代码如下

复制代码

/**
* @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 <= $max) {
  $rollnum = $k;
  break;
}
}
  return $rollnum;
}

$row=roll(array('a'=>10,'b'=>20,'c'=>50));
echo $row;
?>