$dizi = ['tr'=>['status'=>1, 'locale'=>'tr_TR'], 'en'=>['status'=>0, 'locale'=>'en_US']];


foreach ($dizi as $key => $value) {
  if(array_search(1, $value))
    echo $key;
}

$dizi = ['tr'=>['status'=>1, 'locale'=>'tr_TR'], 'en'=>['status'=>0, 'locale'=>'en_US']];

foreach ($dizi as $key => $value) {
  if($value['status'] == 1)
    echo $key;
}