零到1之间的随机数

0到1之间的随机数

function _rand(){    $num = rand();    if($num != 0){        return $num;    }    _rand();}$n = _rand();echo $n/($n+_rand());?>还有一种方式也很好的。while($n == 0 || $u==0){$n = rand();$u = rand();}echo $n/($n+$u);