Add array item inside grouped by array in Laravel 5.5 - php

Question

I have an array in laravel named $destinations and the values are:
Collection {#391 ▼
#items: array:2 [▼
"Chicago, Illinois" => Collection {#398 ▼
#items: array:10 [▶]
}
"New York City, New York" => Collection {#403 ▼
#items: array:10 [▶]
}
]
}
This array is grouped by city name just like Chicago and New York, now I want to add one array item after the city name, it should be like this:
Collection {#391 ▼
#items: array:2 [▼
"Chicago, Illinois" => Collection {#398 ▼
#items: array:10 [▶]
"days" => "2"
}
"New York City, New York" => Collection {#403 ▼
#items: array:10 [▶]
"days" => "7"
}
]
}
I'm trying to use array_merge when i loop the array, I use foreach($destinations as $key => $destination) in the looping, basically the $key will return increment number like 0, 1, 2, etc but in this case it return the city name. Anyone knows how to do it? or how to make the $key still increment number after grouped by in laravel?

Answer 1

As I see your $destinations variable is a collection. So you can iterate through it using each method.
for example:
$destinations = $destinations->each(function ($item, $key) {
// You can modify $item here
// $item['days'] = <no_of_days>;
});
To get the increment number, you can do something like this:
$element_position = 0;
$destinations = $destinations->each(function ($item, $key) use ($element_position) {
// You can modify $item here
// $item['days'] = <no_of_days>;
// You can get the $element_position here
// Iterate $element_position
$element_position++;
});