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| public static function lotto($weight = array())
{
$roll = sprintf("%.2f", mt_rand() / mt_getrandmax() * (array_sum($weight)));
$_tmpW = 0;
$rollnum = 0;
foreach ($weight as $k => $v) {
$min = $_tmpW;
$_tmpW += $v;
$max = $_tmpW;
if ($roll > $min && $roll <= $max) {
$rollnum = $k;
break;
}
}
if ($rollnum == 0 && !is_string($rollnum)) {
return self::lotto($weight);
}
return $rollnum;
}
$lottoArr[1] = 40; //要随机的id =》权重
$lottoArr[2] = 20;
$lottoArr[3] = 40;
$randId = self::lotto($lottoArr); //开始随机
|