mt_rand - php 随机函数 实际概率和设置的概率有差异

<code>php</code><code><?php $result = array();
$configSet = array(
    6 => 0.1,
    5 => 1,
    1 => 27,
    2 => 27,
    3 => 27,
    4 => 17.9,
);
$nums = 30000000;
for($i=1;$i $value){
        $rand += $value * 10000;
        if($random  $value){
    $result[$key] = round((float)($value / $nums) * 1000000)/10000;
}
ksort($result);
print_r($result);
?>
</code>

<code>Array
(
    [1] => 26.985
    [2] => 26.9879
    [3] => 26.987
    [4] => 17.9519
    [5] => 0.9917
    [6] => 0.0964
)
</code>

<code>Array
(
    [1] => 27.0581
    [2] => 27.2639
    [3] => 27.2125
    [4] => 18.1036
    [5] => 0.3031
    [6] => 0.0588
)
</code>

<code>php</code><code><?php $result = array();
$configSet = array(
    6 => 0.1,
    5 => 1,
    1 => 27,
    2 => 27,
    3 => 27,
    4 => 17.9,
);
$nums = 30000000;
for($i=1;$i $value){
        $rand += $value * 10000;
        if($random  $value){
    $result[$key] = round((float)($value / $nums) * 1000000)/10000;
}
ksort($result);
print_r($result);
?>
</code>

<code>Array
(
    [1] => 26.985
    [2] => 26.9879
    [3] => 26.987
    [4] => 17.9519
    [5] => 0.9917
    [6] => 0.0964
)
</code>

<code>Array
(
    [1] => 27.0581
    [2] => 27.2639
    [3] => 27.2125
    [4] => 18.1036
    [5] => 0.3031
    [6] => 0.0588
)
</code>