从数组中获取特定键

Question

Here is what I put in my Symfony session

$this->session->set('teams', [
  'team_1' => ['MyTeamNameA' => ['player-1' => $safe['team-1-player-1'], 'player-2' => $safe['team-1-player-2'], 'player-3' => $safe['team-1-player-3'], 'player-4' => $safe['team-1-player-4'], 'points' => 0]],
  'team_2' => ['MyTeamNameB' => ['player-1' => $safe['team-2-player-1'], 'player-2' => $safe['team-2-player-2'], 'player-3' => $safe['team-2-player-3'], 'player-4' => $safe['team-2-player-4'], 'points' => 0]],               
]);

And now, in my Twig, I want to retrieve my team_1 's name, for example, I did this:

app.session.get('teams')['team_1']

It doesn't work, but, if I do a dump of this last piece of code, I get this result pictured below:

I feel that i'm close to the answer, and yet so far.

Answer 1

Since keys will return you a simple array, then the keys are integer from 0 to the (array | length) - 1 , to express it in Twig.

Note that this is actually the same behaviour as PHP, when you define an array like

['foo', 'bar', 'baz']

that would be strictly equivalent to

[0 => 'foo', 1 => 'bar', 2 => 'baz']

So in your case, since you only have one element in the array you can use array[0] or array.0 .

All together, this would work:

{{ (app.session.get('teams').team_1 | keys).0 }}

^{Could be tested from https://twigfiddle.com/b6iy8i}