Level 50
@romain you can use one of these:
https://laravel.com/docs/master/collections#method-keyby
or
https://laravel.com/docs/master/collections#method-filter
Filter is more "natural" as it iterates over your collection.
Apr 15, 2021
11
Level 30
How to get the key based on values?
Hey,
say that I have this:
$array = [
'english' => [
'USA',
'Canada',
'Australia'
],
'spanish': [
'Spain',
'Venezuela'
]
];
How can I simply, using collect() or Arr::, get english from USA?
Thanks
Level 104
collect($array)->mapWithKeys(
fn ($item, $key) => collect($item)->mapWithKeys(
fn ($element) => [$element => $key]
)
)->get('USA')
This could probably be improved, but works so long as a country is not listed under more than one language ¯\_(ツ)_/¯
2 likes
Level 30
Thanks for that, it's an interesting approach.
Could there be another way of going about it from the beginning? Maybe my array is wrong. The point is that I want to have a "top value" (english) for multiple "lower values" (countries). But the array will grow overtime, so I can set it in stone.
Level 50
As @tykus pointed out you have it nested so you have to "double" the method to get to the nested level.
Level 5
$array = [
'english' => [
'USA',
'Canada',
'Australia'
],
'spanish'=> [
'Spain',
'Venezuela'
]
];
return collect($array)->filter(function($value, $key){
if(in_array('USA', $value)){
return true;
}
return false;
})->keys();
It may not be the best but it works. Use Collection filter
Level 30
Thanks for your reply, you have the same as @corvs but his is a one liner and that would be my preference, so I will make his the best answer.
1 like
Level 5
No problem buddy
Level 27
@romain Is it possible that a country exists for multiple keys?
$langKey = collect($array)->filter(fn($lang) => in_array('USA', $lang))->keys()->first();
Level 30
no, it won't be possible
Level 27
@romain Then you can add ->first() at the end to get only the single key.
Level 30
Yep I'll do that. Just tested and it works as expected. I'll set your first reply as the best answer, please add ->first() in it.
Thanks again
1 like
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