PHP - X numeros ramdom que sumados me den Y

$number = 500;

$randoms = 30;

$nums = array();

while ($randoms--) {

    $nums[] = rand(0, 10) / 10;

}

$sum = array_sum($nums);

foreach ($nums as $k => $num) {

    $nums[$k] /= $sum;

    $nums[$k] *= $number;

}

//Transformo a un entero todos los numeros, redondeando hacia abajo

$nums = array_map('floor', $nums);

// Ordeno el array

sort($nums);

//Elimino el ultimo elemento del array para luego reemplazarlo

array_pop($nums);

//Reemplazo el numero anteriormente eliminado con la diferencia entre la suma total de los numeros generados y el numero a obtener

$nums[] = $number - array_sum($nums);

//Lo desordeno

shuffle($nums);

//Lo muestro

print_r($nums);

Array

(

    [0] => 9

    [1] => 12

    [2] => 6

    [3] => 47

    [4] => 22

    [5] => 3

    [6] => 6

    [7] => 16

    [8] => 16

    [9] => 6

    [10] => 6

    [11] => 22

    [12] => 3

    [13] => 6

    [14] => 32

    [15] => 29

    [16] => 0

    [17] => 19

    [18] => 16

    [19] => 16

    [20] => 25

    [21] => 16

    [22] => 25

    [23] => 16

    [24] => 29

    [25] => 32

    [26] => 6

    [27] => 22

    [28] => 25

    [29] => 12

)