How to insert data on array multidimensional in PHP 7 [duplicate] - php

Question

Following is the output of my multidimensional array $csmap_data
Array
(
[0] => Array
(
[cs_map_id] => 84
[cs_subject_id] => 1
)
[1] => Array
(
[cs_map_id] => 85
[cs_subject_id] => 5
)
[flag] => 1
)
Initially there was no [flag] => 1 key-value in the array, I added it to the array $csmap_data.
But I want to add the [flag] => 1 in the above two array elements, not as a separate array element. In short I wanted following output :
Array
(
[0] => Array
(
[cs_map_id] => 84
[cs_subject_id] => 1
[flag] => 1
)
[1] => Array
(
[cs_map_id] => 85
[cs_subject_id] => 5
[flag] => 1
)
)
The code I was trying to achieve this is as follows, but couldn't get the desired output:
if (!empty($csmap_data)) {
foreach($csmap_data as $csm) {
$chapter_csmap_details = $objClassSubjects->IsClassSubjectHasChapters($csm['cs_map_id']);
$csmap_data ['flag'] = 1;
}
}
Can anyone help me out in obtaining the desired output as I depicted? Thanks in advance.

Answer 1

<?
foreach($csmap_data as $key => $csm)
{
$csmap_data[$key]['flag'] = 1;
}
That should do the trick.

Answer 2

You can also do it using php array functions
$csmap_data = array_map(function($arr){
return $arr + ['flag' => 1];
}, $csmap_data);
UPDATE:
to use multiple variables in callback function of array_map function we can do it by use
$flagValue = 1;
$csmap_data = array_map(function($arr) use ($flagValue){
return $arr + ['flag' => $flagValue];
}, $csmap_data);