PHP - how to search ID and display its value in a object - php

Question

Hi I have an array of object like this
$json = json_decode($featureJson);
//which returns below
Array
(
[0] => stdClass Object
(
[productID] => 1
[productName] => Toyo
[assessments] => Array
(
[0] => stdClass Object
(
[answer] => Yes
)
[1] => stdClass Object
(
[answer] => Yes
)
...
)
)
[1] => stdClass Object
(
[productID] => 2
[productName] => Maze
[assessments] => Array
(
[0] => stdClass Object
(
[answer] => Yes
)
[1] => stdClass Object
(
[answer] => Yes
)
...
)
)
)
and I have another array that needs to match the ID of $json(Array of Objects) and return its productName.
$string = "1,2|2,1";
$IdArray = explode('|', $string);
$foo = '';
foreach ($IdArray as $item) {
$foo .= '{' . $item . '},';
}
echo $foo;
$foo return {1,2},{2,1} and I match $json so will display - {Toyo,Maze},{Maze,Toyo}, how can I do that? I have some hint using array_map()
but still got no idea to match in objects.

Answer 1

It's easier if you separate an array for the names first.
<?php
$featureJson = '[{"productID":1,"productName":"Toyo","assessments":[{"answer":"Yes"},{"answer":"No"}]},{"productID":2,"productName":"Maze","assessments":[{"answer":"Yes"},{"answer":"Yes"}]}]';
$json = json_decode($featureJson);
// Make an array of names
$names = [];
foreach($json as $products){
$names[$products->productID] = $products->productName;
};
$string = "1,2|2,1";
$IdArray = explode('|', $string);
$foo = [];
foreach ($IdArray as $ids) {
$ids = explode(',',$ids);
$fooItem = [];
foreach($ids as $id){
$fooItem[] = $names[$id];
}
$foo[]= '{' . implode(',',$fooItem) . '}'; }
echo implode(',',$foo);
Result:
{Toyo,Maze},{Maze,Toyo}
Check here