merge two array with loop and key name - php

Question

i have two separate arrays $first_one:
Array
(
[0] => Array
(
[_date] => 2019-10-16
[_number] => 1
[_order] => 1
[name] => jack
[other_ids] => Array
(
[b_id] => 1253
)
)
[1] => Array
(
[_date] => 2020-10-11
[_number] => 2
[_order] => 2
[name] => joey
[other_ids] => Array
(
[b_id] => 1433
)
)
)
and the $second_array:
Array
(
[0] => Array
(
[date] => 2019-10-16
[number] => 1
[order] => 1
[name] => jack
[last_name] => foobar
[other_ids] => Array
(
[b_id] => 1253
)
)
[1] => Array
(
[date] => 2020-10-11
[number] => 2
[order] => 2
[name] => joey
[last_name] => foobar
[other_ids] => Array
(
[b_id] => 1433
)
)
[2] => Array
(
[date] => 2020-10-28
[number] => 3
[order] => 3
[name] => tom
[last_name] => foobar
[other_ids] => Array
(
[b_id] => 1593
)
)
)
they are very similar but they came from different api's and they are different in numbers and also some key names.
so what i'm trying to do is to count the $first_one arrays and if for that many loop through the $second_one (in this example is 2) and if the [_number] [_order] from $first_one was equal (==) to [number] [number] $second_one then take some info (for example the last name) from it and put in a new array.
so is this possible to do?

Answer 1

$arr1 = [ [ '_date' => '2019-10-16','_number' => 1,'_order' => 1,
'name' => 'jack','other_ids' => ['b_id' => 1253]
],
['_date' => 2020-10-11,'_number' => 2,'_order' => 2,
'name' => 'joey','other_ids' => ['b_id' => 1433]
]
];
$arr2 = [ [ 'date' => '2019-10-16','number' => '1','order' => '1',
'name' => 'jack','last_name' => 'foobar','other_ids' => ['b_id' => 1253]
],
[ 'date' => '2019-10-11','number' => '2','order' => '2',
'name' => 'joey','last_name' => 'foobar','other_ids' => ['b_id' => 1433]
],
[ 'date' => '2019-10-28', 'number' => '3', 'order' => '3',
'name' => 'tom', 'last_name' => 'foobar', 'other_ids' => ['b_id' => 1593]
],
];
// first make second array more directly searchable
// make new array with the `number` as the key
foreach( $arr2 as $a){
$arr2new[$a['number']] = $a;
}
foreach ($arr1 as $a) {
if ( array_key_exists($a['_number'], $arr2new) &&
$a['_order'] == $arr2new[$a['_order']]['order'] )
{
$merged[] = ['name'=>$a['name'], 'other_ids' => $a['other_ids']];
}
}
print_r($merged);
RESULT
Array
(
[0] => Array (
[name] => jack
[other_ids] => Array
(
[b_id] => 1253
)
)
[1] => Array (
[name] => joey
[other_ids] => Array
(
[b_id] => 1433
)
)
)