How get a object by id from arrays of object? - php

Question

Assuming that I have an array of objects like this:
Array
(
[0] => stdClass Object
(
[id] => 10-423-1176
[qty] => 2
[price] => 12.6
)
[1] => stdClass Object
(
[id] => 26-295-1006
[qty] => 24
[price] => 230.35
)
[2] => stdClass Object
(
[id] => 12-330-1000
[qty] => 2
[price] => 230.35
)
And I have another array of object hat looks like this:
Array
(
[0] => Item Object
(
[internalId] => 14062
[itemVendorCode] => 89-605-1250
)
[1] => Item Object
(
[internalId] => 33806
[itemVendorCode] => 89-575-2354
)
[2] => Item Object
(
[internalId] => 64126
[itemVendorCode] => 26-295-1006
)
)
I want to loop through the 2nd array of objects and get the 'itemVendorCode' and then use it as the 'id' to get the object from the first array of objects. Is there a way to obtain what I want without looping the first array? Looping is very costly in my use-case.

Answer 1

You will have to use loops in any case, even if those loops are hidden within PHP built-in functions.
For instance:
$codes = array_map(function ($item) { return $item->itemVendorCode; }, $array2);
$items = array_filter($array1, function ($item) use ($codes) { return in_array($item->id, $codes); });
// $items contains only elements from $array1 that match on $array2
If this will be more efficient than using regular loops is hard to tell.
Since you are aparently trying to code what is supposed to be a DBMS's job, I recommend you export those tables to a database server such as MySQL instead and let it work its magic on those "JOINs".
Answering your comment, you could merge with something like this:
$result = array();
foreach ($array1 as $item1)
foreach ($array2 as $item2)
if ($item1->id == $item2->itemVendorCode)
$result[] = (object)array_merge((array)$item1, (array)$item2));
$result will contain a new set of objects that merge properties from both $array1 and $array2 where they intersect in id == itemVendorCode.

Answer 2

Do you need first arrays index keys? if not you could iterate throuh first array once and set key to id. Something like:
foreach ($items as $key => $item) {
$items[$item->id] = $item;
unset($items[$key]);
}

Answer 3

Here is another direct approach to solve this problem, even better than the one I proposed earlier:
// you got the $itemVendorCode from looping through the second array, let say :
$itemVendorCode = "89-605-1250";
// I'm assuming that you converted the array of objects in into accessible multidimensional array
// so the $first_array would look like :
$first_array= array (
array (
"id" => "10-423-1176",
"qty" => 2,
"price" => 12.6
),
array (
"id" => "10-423-1176",
"qty" => 5,
"price" => 25
),
array (
"id" => "89-605-1250",
"qty" => 12,
"price" => 30
)
);
// Now you can filter the first array using
$filter = function ($player) use($itemVendorCode) {
return $player ['id'] == $itemVendorCode;
};
$filtered = array_filter ( $first_array, $filter );
// print the price of the matching filtered item
print $filtered[key($filtered)]['price'] ;

Answer 4

You can use the array_map and array_filter() function to achieve that.
Try with this code:
<?php
$first = array();
$first[0] = new stdClass;
$first[0]->id = '89-605-1250';
$first[0]->qty = 2;
$first[0]->price = 12.6;
$first[1] = new stdClass;
$first[1]->id = '89-575-2354';
$first[1]->qty = 24;
$first[1]->price = 230.35;
$last = array();
$last[0] = new stdClass;
$last[0]->internalId = 14062;
$last[0]->itemVendorCode = '89-605-1250';
$last[1] = new stdClass;
$last[1]->internalId = 33806;
$last[1]->itemVendorCode = '89-575-2354';
$ids = array_map(function($element){return $element->itemVendorCode;}, $last);
$to_find = $ids[0];
$object = array_filter($first, function($element){global $to_find; return $element->id == $to_find ? true: false;})[0];
print_r($object);
?>
Output:
stdClass Object
(
[id] => 89-605-1250
[qty] => 2
[price] => 12.6
)

Answer 5

try using array_search:
http://php.net/manual/en/function.array-search.php
foreach($array2 as $key=>$item) {
$firstArrayObjectKey = array_search($item['itemVendorCode'], $array1);
//... do something with the key $firstArrayObjectKey
}

Answer 6

In this case you'll need to loop through the first array to get the itemVendorCode.
Right after that you can use the itemValue you got from the previous process to search in a reduced array of the first object using array_reduce function:
http://php.net/manual/en/function.array-reduce.php