search some object data in array [duplicate] - php

Question

This question already has answers here:
Filter multidimensional array by value in array [duplicate]
(2 answers)
Closed 3 years ago.
I have an array like this:
$array = (
[0] => stdClass Object
(
[ID] => 420
[name] => Mary
)
[1] => stdClass Object
(
[ID] => 10957
[name] => Blah
)
)
...
I found some solution to search using loop like this:
$item = null;
foreach($array as $struct) {
if ($v == $struct->ID) {
$item = $struct;
break;
}
}
Because of the large amount of data, I want to change it so that I can retrieve multiple values ​​instead of one value at a time (ex: $array->420 = Mary, $array->10957 = Blah,...). Which way would be the most optimal in this case?

Answer 1

If you index your main array by the ID (use array_column() for this), and an array of the ID's you are after, then array_intersect_key() will extract all of the ones you want into a list of the matches...
$array =[
(Object)
[
"ID" => 420,
"name" => "Mary"
],
(Object)
[
"ID" => 10957,
"name" => "Blah"
]
];
$ids = [420, 10957];
$indexArray = array_column($array, null, "ID" );
$matches = array_intersect_key($indexArray, array_flip($ids));
print_r($matches);
gives..
(
[420] => stdClass Object
(
[ID] => 420
[name] => Mary
)
[10957] => stdClass Object
(
[ID] => 10957
[name] => Blah
)
)
You need to use array_flip() on the ID's array to convert the value into the key to work with the array_intersect_key() function.
You can then use array_values() if you don't want the key for this data (i.e. the ID)

Answer 2

Here's three possible solutions depending on your needs, using array_column:
Build an ID => name array:
$result = array_column($array, 'name', 'ID');
Build an ID => entry array (if you have more stuff than just the name):
$result = array_column($items, null, 'ID');
Alternative using array_reduce:
$result = array_reduce($array, static function ($result, $item) {
$result[$item['ID']] = $item;
return $result;
});
Demo: https://3v4l.org/fLMgL