首先根据值合并两个数组，然后根据key-php合并第二个数组

Question

I have two arrays

First array named "$periods" and second array named "$groupExport" like below.

First Array - $periods

Array
(
    [0] => 201308
    [1] => 201309
    [2] => 201310
)

Second Array - $groupExport

Array
(
    [0] => Array
        (
            [GroupCode] => 111
            [GroupDesc] => Crop Production
            [201308] => 1.5500
            [201309] => 240.4200
            [201310] => 41.2110
        )

    [1] => Array
        (
            [GroupCode] => 112
            [GroupDesc] => Animal Production
            [201309] => 3.1800
        )

    [2] => Array
        (
            [GroupCode] => 115
            [GroupDesc] => Agriculture, Forestry Support
            [201308] => 234.0400
            [201310] => 343.0200
        )
)

I have tried atleast 5-6 different code ideas, it does not yields the below output. I want the output like below, so that I can display the resultset in table format according to the header GroupCode, GroupDesc, 201308, 201309 & 201310. Could anyone help me to resolve this?

Output

Array
(
    [0] => Array
        (
            [GroupCode] => 111
            [GroupDesc] => Crop Production
            [201308] => 1.5500
            [201309] => 240.4200
            [201310] => 41.2110
        )

    [1] => Array
        (
            [GroupCode] => 112
            [GroupDesc] => Animal Production
            [201308] => 0
            [201309] => 3.1800
            [201310] => 0
        )

    [2] => Array
        (
            [GroupCode] => 115
            [GroupDesc] => Agriculture, Forestry Support
            [201308] => 234.0400
            [201309] => 0
            [201310] => 343.0200
        )
)

Answer 1

Loop through the $groupExport array and on each iteration, loop through the sub-array and check if the each one of the period index exists. If they don't, initialize them with 0.

foreach ($groupExport as & $export) {
    foreach ($periods as $period) {
        if (!isset($export[$period])) {
            $export[$period] = 0;
        }
    }
}

Note the & before $export . It means we're passing the array by reference — it's modifying $groupExport on each iteration.

Demo

Answer 2

Note: This will mutate the original array. If you want to produce a new array, @AmalMurali's solution is superior.

Here's an alternate solution that uses some of PHP's built-in functions:

$keys = array_fill_keys($periods, 0);
array_walk($groupExport, function (&$item, $key, $keys) {
    $item += $keys;
}, $keys);

Here's a demonstration at IDEOne.com .

---

Explanation

$keys = array_fill_keys($periods, 0);

This converts your array of periods into a new array where the value from the original array is now the key, and the value is 0 .

array_walk($groupExport, function (&$item, $key, $keys) {
    $item += $keys;
}, $keys);

We walk over each element of the array $groupExport , and apply a function to each member. We pass each array element as a reference to our user defined function, which allows us to manipulate it directly.

Finally, we add $keys to $item which essentially merges the two arrays while maintaining key associations.

Output

Array
(
    [0] => Array
        (
            [GroupCode] => 111
            [GroupDesc] => Crop Production
            [201308] => 1.55
            [201309] => 240.42
            [201310] => 41.211
        )

    [1] => Array
        (
            [GroupCode] => 112
            [GroupDesc] => Animal Production
            [201309] => 3.18
            [201308] => 0
            [201310] => 0
        )

    [2] => Array
        (
            [GroupCode] => 115
            [GroupDesc] => Agriculture, Forestry Support
            [201308] => 234.04
            [201310] => 343.02
            [201309] => 0
        )

)

---

• array_fill_keys
• array_walk