请帮我用PHP求解这个方程。我有以下变量：
$p = 5;
$n = array();
$y = array(4,2,7,10,5,16,77,28,19,65,8,21);
$s1 = 10;
$h = array();
我的公式是这样的：
n1 = p*s1*y1; h1 = s1;
n2 = p*s1*y2; h2 = s1;
n3 = p*s1*y3; h3 = s1;
n4 = p*s1*y4; h4 = s1;
n5 = p*s1*y5; h5 = s1;
n6 = p*s1*y6; h6 = s1;
s2 = s1+n1+n2+n3+n4+n5+n6;
n7 = p*s2*y7; h7 = s2;
n8 = p*s2*y8; h8 = s3;
n9 = p*s2*y9; h9 = s4;
n10 = p*s2*y10; h10 = s5;
n11 = p*s2*y11; h11 = s6;
n12 = p*s2*y12; h12 = s7;
s3 = s2+n7+n8+n9+n10+n11+n12;
....
如何使用for()循环将其保存在数组$n中？
这里是：
$p = 5;
$n = array();
$y = array(4,2,7,10,5,16,77,28,19,65,8,21);
$s = array( 1 => 10);
$k = 1;
for($i = 1; $i <= count($y); $i++)
{
$n[$i] = $p * $s[$k] * $y[$i-1];
if($i % 6 === 0) {
$k++;
$s[$k] = $n[$i] + $n[$i-1] + $n[$i-2] + $n[$i-3] + $n[$i-4] + $n[$i-5];
}
}
print_r($s);
print_r($n);
结果：
Array
(
[1] => 10
[2] => 2200
[3] => 2398000
)
Array
(
[1] => 200
[2] => 100
[3] => 350
[4] => 500
[5] => 250
[6] => 800
[7] => 847000
[8] => 308000
[9] => 209000
[10] => 715000
[11] => 88000
[12] => 231000
)