Remove unwanted elements from subarrays in multidimensional array - php

Question

I have a multidimensional array like this:
[
[
'id' => 1,
'name' => 'John',
'address' => 'Some address 1'
'city' => 'NY'
],
[
'id' => 2,
'name' => 'Jack',
'address' => 'Some address 2'
'city' => 'NY'
]
...
[ ... ]
]
How can I remove elements in all subarrays and only retain the id and name keys with their values?

Answer 1

Would this work?
$result = array_map(function($arr) {
return [
'id' => $arr['id'],
'name' => $arr['name']
];
}, $orig_array);

Answer 2

You want to retain the first two associative elements, so you can make array_slice() calls within array_map(). (Demo)
var_export(
array_map(fn($row) => array_slice($row, 0, 2), $array)
);
Or mapped called of array_intersect_key() against an establish whitelist array. (Demo)
$keep = ['id' => '', 'name' => ''];
var_export(
array_map(
fn($row) => array_intersect_key($row, $keep),
$array
)
)
Or, you could use array destructuring inside of a classic foreach() and make iterated compact() calls. (Demo)
$result = [];
foreach ($array as ['id' => $id, 'name' => $name]) {
$result[] = compact(['id', 'name']);
}
var_export($result);

Answer 3

If you want to edit the same array in place, you can simply iterate over them and unset them.
<?php
$preserve_keys = ['id','name'];
foreach($arr as &$data){
foreach($data as $key => $value){
if(!in_array($key,$preserve_keys)){
unset($data[$key]);
}
}
}
If you want it as a separate result, loop over and add it to the new array.
<?php
$new_result = [];
foreach($arr as $data){
$new_result[] = [
'id' => $data['id'],
'name' => $data['name']
];
}
print_r($new_result);