Map Array in child in php - php

Question

I have 2 arrays in php which look like following:
array1 = [product_id = [data], product_id = [data], ..]
[
101 => [
"sku" => "AB01"
],
201 => [
"sky" => "AB02"
],
...
]
array2 = attribute of product with product_id
[
0 => [
"product_id" => 101,
"name" => "pro 1"
],
1 => [
"product_id" => 101,
"size" => "S"
],
2 => [
"product_id" => 201,
"name" => "pro 2"
],
3 => [
"product_id" => 201,
"size" => "S"
],
...
]
What I want is according to product_id in array2 data is pushed in array1 as child array like this
[
101 => [
"sku" => "AB01",
"attributes" => [
0 => [
"product_id" => 101,
"name" => "pro 1"
],
1 => [
"product_id" => 101,
"size" => "S"
]
]
],
201 => [
"sky" => "AB02",
"attributes" => [
0 => [
"product_id" => 201,
"name" => "pro 2"
],
1 => [
"product_id" => 201,
"size" => "S"
]
]
],
...
]
Array length is around 1000 for array1 and >5000 for array2. foreach loop taking too much time. Is there any fast way to achieve it?

Answer 1

About the fastest way I can think of achieving this is using a foreach loop over the second array, as your first array is indexed by the product_id, it is easy to directly insert the new data on each loop...
foreach ( $array2 as $item ) {
$array1[$item['product_id']]['attributes'][] = $item;
}

Answer 2

Maybe it helps you
$array1 = [
101 => [
"sku" => "AB01"
],
201 => [
"sky" => "AB02"
]
];
$array2 = [
0 => [
"product_id" => 101,
"name" => "pro 1"
],
1 => [
"product_id" => 101,
"size" => "S"
],
2 => [
"product_id" => 201,
"name" => "pro 2"
],
3 => [
"product_id" => 201,
"size" => "S"
]
] ;
foreach ($array2 as $result){
if(array_key_exists($result['product_id'], $array1)) {
$array1[$result['product_id']]['attributes'][] = $result;
}
}
print_r($array1);
your result look like this
Array
(
[101] => Array
(
[sku] => AB01
[attributes] => Array
(
[0] => Array
(
[product_id] => 101
[name] => pro 1
)
[1] => Array
(
[product_id] => 101
[size] => S
)
)
)
[201] => Array
(
[sky] => AB02
[attributes] => Array
(
[0] => Array
(
[product_id] => 201
[name] => pro 2
)
[1] => Array
(
[product_id] => 201
[size] => S
)
)
)
)

Answer 3

$arr1=[
101 => [
"sku" => "AB01"
],
201 => [
"sky" => "AB02"
]
];
$arr2=[
0 => [
"product_id" => 101,
"name" => "pro 1"
],
1 => [
"product_id" => 101,
"size" => "S"
],
2 => [
"product_id" => 201,
"name" => "pro 2"
],
3 => [
"product_id" => 201,
"size" => "S"
]
];
foreach ($arr2 as $arr_val ) {
$arr1[$arr_val['product_id']]['attributes'][] = $arr_val;
}
echo "<pre>"; print_r($arr1);

Answer 4

I hope this answer work for you
first array
$arr = [
101 => [
"sku" => "AB01"
],
201 => [
"sky" => "AB02"
],
];
second array
$arr2 = [
0 => [
"product_id" => 101,
"name" => "pro 1"
],
1 => [
"product_id" => 101,
"size" => "S"
],
2 => [
"product_id" => 201,
"name" => "pro 2"
],
3 => [
"product_id" => 201,
"size" => "S"
],
];
finally this what i try to do
$newArr = [];
forEach($arr as $product_id => $product_value){
$attrArr = [];
forEach($arr2 as $key => $value){
if($product_id == $value['product_id']){
$attrArr[] = $value;
$newArr[$product_id] = [
array_keys($product_value)[0] => array_values($product_value)[0],
];
}
}
$newArr[$product_id]['attributes'] = $attrArr;
}
echo '<pre>';
print_r($newArr);
echo '</pre>';