ACF – Query relationship without ID

If only 1 value in relation field : 

$city_id = $bnb_ville[0]->ID;

if it could be more than 1 value : 

$city_id = [];
foreach ($var as $post) {
    $city_id[] = $post->ID;
}

$bnb_ville is the variable for get_field() !

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