获取总数的随机加数

function get_price($amount_money,$num){    $total = $amount_money; //待划分的数字    $div = $num; //分成的份数    $area = 50; //各份数间允许的最大差值    $average = round($total / $div);    $sum = 0;    $result = array_fill( 1, $div, 0 );    for( $i = 1; $i < $div; $i++ ){        //根据已产生的随机数情况，调整新随机数范围，以保证各份间差值在指定范围内        if( $sum > 0 ){            $max = 0;            $min = 0 - round( $area / 2 );        }elseif( $sum < 0 ){            $min = 0;            $max = round( $area / 2 );        }else{            $max = round( $area / 2 );            $min = 0 - round( $area / 2 );        }        //产生各份的份额        $random = rand( $min, $max );        $sum += $random;        $result[$i] = $average + $random;    }    //最后一份的份额由前面的结果决定，以保证各份的总和为指定值    $result[$div] = $average - $sum;    foreach( $result as $temp ){        $data[]=$temp;    }    return $data;}