Appending property to stdClass Object in PHP while in loop

Question

Looping through an Array of stdClass Objects, I'd like to add a new property to the Object. Of all the ways I've tried and researched, none end up adding the new property.

Array 
(
    [0] => stdClass Object
        (
            [id] => 12345678
            [profile] => stdClass Object
                (
                    [type] => superAdmin
                )
        )
    [1] => stdClass Object
        (
            [id] => 89101112
            [profile] => stdClass Object
                (
                    [type] => admin
                )
        )
)

I have a function that takes in the above array, and then should iterate through it, if certain criteria met, add a new property to the object, and return the array.

public function addToProfile($usernameArr) {

      $users = $usernameArr;

      foreach ($users as $key => $user) {
        if (in_array("admin", $user->profile->type)) {
          $users[$key]->profile->newProperty = "newItem";
        }
      }

      return $users;

    }

I've also tried the json_decode(json_encode($users), true) way which did not end up with the result I'm looking for.

@PatrickQ it does indeed. I did have some other code in place of in_array while testing a few different iterations, and had something without error in the if block, but it would still not add the new property. — creative_humorous_username
– creative_humorous_username, Commented Jan 29, 2020 at 21:25
Okay, and do you understand what the error ("in_array() expects parameter 2 to be array, string given") is telling you? — Patrick Q
– Patrick Q, Commented Jan 29, 2020 at 21:31
I do, I mistakenly am pointing to a string and not an array. — creative_humorous_username
– creative_humorous_username, Commented Jan 29, 2020 at 22:31

Aksen P · Accepted Answer · 2020-01-29 21:41:20Z

You can do it via transformation $user object to the array and back to object:

foreach ($users as $key=>&$user) {
    if (in_array("admin", $user->profile->type)) {

        // represents current $user->profile object as an array    
        $tmp = json_decode(json_encode($user->profile),true); 
        // add a new index
        $tmp['newproperty'] = "$key newItem"; 
        // transform back to an object
        $user->profile = (object)($tmp); 
    }
}

Demo

You can put it into the function like:

 function addNewProp($data, $prop_name, $prop_val){

    foreach ($data as $key=>$user) {
        if (in_array("admin", $user->profile->type)) {

            $tmp = json_decode(json_encode($user->profile),true); 
            $tmp[$prop_name] = $prop_val;
            $user->profile = (object)($tmp); 
        }
    }
    return $data;
 }

Demo

Your input value of type has string datatype. Instead of

if (in_array("admin", $user->profile->type)) {

you should use

if ($user->profile->type === "admin") {

Alex Barker · Accepted Answer · 2020-01-29 21:56:47Z

0

Generally, I try and avoid doing things like (object)array(...) and json_decode(json_encode()) in PHP as it is not immediately clear to the reader why your doing this round about stuff, so I will provide an alternative answer.

 function addNewProp(array $users, $propName, $propVal)
 {
    for ($i = 0; $i < count($users); $i++) {
        // You may need to do extra checking here if profile and type are not required.
        if (isset($users[$i]->profile->type->admin)) {
            $users[$i]->profile->$propName = $propVal;
        }
    }
    return $users;
 }

answered Jan 29, 2020 at 21:56

Alex Barker

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