Combine array of objects using keys - php

Question

I want to combine two arrays of objects. Let me give you an example:
Example:
// First array:
$array1 = [
{ name => 'Joe', p_id => 1 },
{ name => 'Bob', p_id => 2 },
{ name => 'Sam', p_id => 4 }
]
// Second array:
$array2 = [
{ id => 1, name => 'X' },
{ id => 2, name => 'Y' },
{ id => 4, name => 'Z' }
]
Expected output:
$output = [
{ name => 'Joe + X', id => 1 },
{ name => 'Bob + Y', id => 2 },
{ name => 'Sam + Z', id => 4 }
]
Goal:
I want the fastest possible way to combine the name property in the second array with the name property in the first array.
Note: The p_id property in the first array is the same as the id property in the second array.
What i try:
I've used nested loops that have a very low speed.

Answer 1

array_map is the solution!
Given:
$first = [
{ name => 'Joe', p_id => 1 },
{ name => 'Bob', p_id => 2 },
{ name => 'Sam', p_id => 4 },
];
$second = [
{ id => 1, name => 'X' },
{ id => 2, name => 'Y' },
{ id => 4, name => 'Z' },
];
The solution is just simply:
$result = array_map(
static function (\stdClass $first, \stdClass $second): array {
return [
'name' => $first->name . ' + ' . $second->name,
'id' => $first->p_id,
];
},
$first, $second
);
PS: I assume the objects are \stdClass, replace it by the correct one.

Answer 2

Here is a solution for when the ids of the elements inside the array are not in order. Notice that I have changed the order of $array1. Just a bit better than the regular nested loops, on the loop of the $array2 it will remove the "found" elements to improve speed of the next loop.
From:
// First array:
$array1 = [
(object) ['name' => 'Joe', 'p_id' => 1],
(object) ['name' => 'Sam', 'p_id' => 4],
(object) ['name' => 'Bob', 'p_id' => 2],
];
// Second array:
$array2 = [
(object) ['id' => 1, 'name' => 'X'],
(object) ['id' => 2, 'name' => 'Y'],
(object) ['id' => 4, 'name' => 'Z'],
];
Solution:
$result = [];
foreach ($array1 as $array1Element) {
for ($i=0;$i<count($array2);$i++) {
if ($array1Element->p_id === $array2[$i]->id) {
$array2[$i]->name = $array1Element->name . ' + ' . $array2[$i]->name;
$result[] = $array2[$i];
unset($array2[$i]);
$array2 = array_values($array2);
break;
}
}
}