如何根据PHP中的键值回显数组中的值

Question

Please help me with this array printing.

Array

 [year_2014] => Array
    (
        [0] => Array
            (
                [amount] => 21960
                [year] => 2014
                [month] => 1
            )

        [1] => Array
            (
                [amount] => 25866
                [year] => 2014
                [month] => 2
            )

        [2] => Array
            (
                [amount] => 7840
                [year] => 2014
                [month] => 3
            )

        [3] => Array
            (
                [amount] => 424644
                [year] => 2014
                [month] => 5
            )

        [4] => Array
            (
                [amount] => 22052
                [year] => 2014
                [month] => 6
            )

        [5] => Array
            (
                [amount] => 28037
                [year] => 2014
                [month] => 7
            )

    )

I need to echo amount in according to month so the Output will be,

Result

  21960, 25866, 7840, 0, 424644, 22052, 28037, 0, 0, 0, 0, 0

That is if a month is not present then the value need to be zero,I need all the twelve month.

My dear Good Hearts please help me to get this result.

Some background

project is done in codeigniter , I have messed with some for, foreach but it's not working.

Thank you.

Answer 1

Just try with:

$output = array_fill(0, 12, 0);
array_map(function ($item) use (&$output) {
    $output[$item['month'] - 1] = $item['amount'];
}, $input['year_2014']);

or with simple foreach:

$output = array_fill(0, 12, 0);
foreach ($input['year_2014'] as $item) {
    $output[$item['month'] - 1] = $item['amount'];
}

Output:

array (size=12)
  0 => int 21960
  1 => int 25866
  2 => int 7840
  3 => int 0
  4 => int 424644
  5 => int 22052
  6 => int 28037
  7 => int 0
  8 => int 0
  9 => int 0
  10 => int 0
  11 => int 0

Explanation:

array_fill creates an array with 12 elements filled with 0 values.

foreach loops over year_2014 data arrays and sets item's amounts to the month - 1 position.

array_map does the same as foreach and can be an overkill here, but also works well.