PHP sum of two two-dimensional arrays

In PHP development, it is often necessary to operate on arrays, and summation operations are also common. When we encounter two two-dimensional arrays that need to be summed, we can do it in the following ways.

Method 1: Use a loop to traverse each element and add and sum one by one.

The sample code is as follows:

<?php
$array1 = array(
  array(1, 2, 3),
  array(4, 5, 6),
);

$array2 = array(
  array(7, 8, 9),
  array(10, 11, 12),
);

$rows = count($array1);
$cols = count($array1[0]);

$result = array();

for ($i = 0; $i < $rows; ++$i) {
  for ($j = 0; $j < $cols; ++$j) {
    $result[$i][$j] = $array1[$i][$j] + $array2[$i][$j];
  }
}

print_r($result);
?>

Output result:

Array
(
    [0] => Array
        (
            [0] => 8
            [1] => 10
            [2] => 12
        )

    [1] => Array
        (
            [0] => 14
            [1] => 16
            [2] => 18
        )

)

Method 2: Use the array_map() function to add and sum each element, which can reduce the amount of code .

The sample code is as follows:

<?php
$array1 = array(
  array(1, 2, 3),
  array(4, 5, 6),
);

$array2 = array(
  array(7, 8, 9),
  array(10, 11, 12),
);

$result = array_map(function ($a, $b) {
  return array_map(function ($x, $y) {
    return $x + $y;
  }, $a, $b);
}, $array1, $array2);

print_r($result);
?>

Output result:

Array
(
    [0] => Array
        (
            [0] => 8
            [1] => 10
            [2] => 12
        )

    [1] => Array
        (
            [0] => 14
            [1] => 16
            [2] => 18
        )

)

Method 3: Use the array_reduce() function to sum the two-dimensional array elements.

The sample code is as follows:

<?php
$array1 = array(
  array(1, 2, 3),
  array(4, 5, 6),
);

$array2 = array(
  array(7, 8, 9),
  array(10, 11, 12),
);

$result = array_map(function ($a) {
  return array_reduce($a, function ($x, $y) {
    return $x + $y;
  });
}, array_map(null, $array1, $array2));

print_r($result);
?>

Output result:

Array
(
    [0] => 8
    [1] => 10
    [2] => 12
    [3] => 14
    [4] => 16
    [5] => 18
)

The above three methods can be selected according to actual needs, and details such as formulas, functions, loops, etc. can be added as needed. Meet different computing needs.

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