Best way to Sum one dimension of a 3 dimensional array

[markmax33]

Guys,
I have been summing one element of a 3 dimensional array. My method works, but I think there is a better way to do it. My current way of doing this is causing me problems later in my code.

line 1 for ($j = 0 ; $j < $z ; $j++){
line 2 for ($k = 0 ; $k <= $y; $k++){
line 3 for ($i = 0 ; $i < $x; $i++){
line 4 $foo[$j][$k] = $bar[$j][$k][$i] + $foo[$j][$k];};};}

Specifically in line 4 the 2nd $foo[$j][$k] gets caught into memory and doesn't get reset. Is there a better way to sum one dimension of a multidimensional array?

[laserlight]

Specifically in line 4 the 2nd $foo[$j][$k] gets caught into memory and doesn't get reset.

What do you mean by that?

Is there a better way to sum one dimension of a multidimensional array?

As I understand it, you have a 3D array and wish to generate a 2D array where each element of its inner array is the sum of the elements of the inmost array of the 3D array. Based on your example, there may be a simplification:

for ($j = 0; $j < $z; $j++) {
    for ($k = 0; $k <= $y; $k++) {
        $foo[$j][$k] = array_sum($bar[$j][$k]);
    }
}

I am wary of the $k <= $y condition though, since typically if you start the index from 0, you want a $k < $y check.