data_get function parameter not working as expected

[arifmahmudrana]

For data_get function I can pass string|array as $key & the $default = null https://github.com/laravel/framework/blob/5.2/src/Illuminate/Support/helpers.php#L401-L405. Now I have a collection

$collection = collect(['title' => 'Lean Startup', 'category' => 'story', 'price' => 10]);
$result = data_get($collection, ['title', 'category']);//I want to get title & category from my collection

Now if you data_get function code it first extracts the keys & loops through it.

When we have key of * it returns all but if we a single key or a string of key it returns ok. But if we have $key with multiple values it returns wrong the default value because every time assigns the value

if (Arr::accessible($target) && Arr::exists($target, $segment)) {
    $target = $target[$segment];//assigns value
} elseif (is_object($target) && isset($target->{$segment})) {
    $target = $target->{$segment};//assigns value
} else {
    return value($default);
}

So at first though $target is

Illuminate\Support\Collection {#729
     all: [
       "title" => "Lean Startup",
       "category" => "story",
       "price" => 10,
     ],
   }

when $key is title the $target is replaced $target = $target[$segment]; & here $target is string & it's value is "Lean Startup" so in the next iteration (Arr::accessible($target) && Arr::exists($target, $segment)) or (is_object($target) && isset($target->{$segment})) neither condition satisfies as $target = 'Lean Startup' so it returns $default value which is null.

[vlakoff]

Maybe you got it wrong: data_get($collection, ['title', 'category']) is basically the same as data_get($collection, 'title.category').

[vlakoff]

For your use case, you would need to use data_get() twice: data_get($collection, 'title') and data_get($collection, 'category').

[arifmahmudrana]

@vlakoff yeah I am wrong data_get function just fetches a value by key. But the confusion was created because of key being an array. But now I understand the purpose.

[vlakoff]

No problem :) The "array notation" isn't very explicit per se; it's more for internal uses.