How to search for value in Array/object in PHP?

Question

Personal I have the following array:

stdClass Object (
   [Chats] => Array (
       [0] => stdClass Object (
           [Chat] => stdClass Object (
               [ChatId] => 13383
               [UserId] => a2784a6dcf
               [SystemId] => a2784a6dcf~a2784a6dcf_OVL
               [Fullname] => chris
               [Email] => [email protected]
           )
       )
       [1] => stdClass Object (
           [Chat] => stdClass Object (
               [ChatId] => 13383
               [UserId] => a2784a6dcf
               [SystemId] => a2784a6dcf~a2784a6dcf_OVL
               [Fullname] => chris
               [Email] => [email protected]
           )
       )
   )
)

I’m in doubt on how I would travel these arrays taking the value user_id?

How do I access the value of UserId?

Answer 1

Whereas you have the following structure:

$data = (object) [
  "Chats" => [
    (object) ["Chat" => (object) ["ChatId" => 1000]],
    (object) ["Chat" => (object) ["ChatId" => 2000]],
    (object) ["Chat" => (object) ["ChatId" => 3000]],
    (object) ["Chat" => (object) ["ChatId" => 4000]],
    (object) ["Chat" => (object) ["ChatId" => 5000]],
  ]
];

It is worth noting that when doing the cast of a array associative to object PHP will create an instance of stdClass, so we can say that the above structure is equivalent to the question only disregarding the unused fields (UserId, SystemId, etc.).

You can get the list of ids in various ways.

1) Through in loop loop

$ChatIds = [];

foreach ($data->Chats as $Chat) {
    $ChatIds[] = $Chat->Chat->ChatId;
}

Getting the result [1000, 2000, 3000, 4000, 5000].

^{See working on Ideone}

2) Through the function array_column

$Chats = array_column($data->Chats, "Chat");
$ChatIds = array_column($Chats, "ChatId");

Getting the result [1000, 2000, 3000, 4000, 5000].

^{See working on Ideone}

3) Through the function array_map

$ChatIds = array_map(function ($chat) {
  return $chat->Chat->ChatId;
}, $data->Chats);

Getting the result [1000, 2000, 3000, 4000, 5000].

^{See working on Ideone}

Answer 2

You will have to go putting the keys as indexes, run the example below:

<?php
    $array[0]['teste'][12]['abc'] = "ola";
    print_r($array);
?>

Note that an array has been created with the keys 0, test, 12, abc which are the indices that lead up to the information "hello".

In your example probably if you were assigned to an array, the code can look like this:

$array["Chats"][0]["Chat"]["UserId"]

Answer 3

There goes what I did:

To access the value of Userid, I realized that I will have to use the notation to access objects (->) wherever stdClass Object and normal array indexes where you have array.

echo $array->Chats[0]->Chat->UserId;

To scroll through this array would look like this:

foreach ($array->Chats as $key => $array2){
    $aux .= $array2->Chat->UserId;
}

Answer 4

By your example, it would be enough to do this:

$obj = new stdClass('Chats');

$chat_obj_0 = new stdClass();
$chat_obj_0->ChatId = 133831;
$chat_obj_0->UserId = "a2784a6dcf1";
$chat_obj_0->SystemId = "a2784a6dcf~a2784a6dcf_OVL1";
$chat_obj_0->Fullname = "chris 1";
$chat_obj_0->Email = "[email protected]";

$chat_obj_1 = new stdClass();
$chat_obj_1->ChatId = 133832;
$chat_obj_1->UserId = "a2784a6dcf2";
$chat_obj_1->SystemId = "a2784a6dcf~a2784a6dcf_OVL2";
$chat_obj_1->Fullname = "chris 2";
$chat_obj_1->Email = "[email protected]";



   $n1 = (object) ['Chat' => $chat_obj_0];

   $n2 = (object) ['Chat' => $chat_obj_1];



$obj->Chats = array(
    0 =>  $n1,
    1 =>  $n2
  );


foreach($obj->Chats as $item) {

       echo 'Chat ID: ' . $item->Chat->ChatId . "<br>";
       echo 'User ID: ' . $item->Chat->UserId;
}

print_r($obj);

Ideone