Many people know PHP random sorting, but how to implement weighted random sorting? This article will share the data randomly sorted according to weight, I hope it will be helpful to everyone.
The specific implementation method is as follows:
<?php
/**
* @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;
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