PHP echo values of all sub keys [duplicate]

foreach($array['options'] as $key => $value) 
{ 
    echo $value['pt']."<br>"; 
}

$options = [
  "front-electric" => [
      "pt" => "Vidros Eléctricos dianteiros",
      "en" => "Front electric"
  ],
  "electric-diant-back" => [
      "pt" => "Vidros Eléctricos diant. + trase.",
      "en" => "Electric diant. + Back."
  ],
  "darkened" => [
      "pt" => "Vidros Escurecidos",
      "en" => "Darkened"
  ],
  "soundproofing-and-athermic" => [
      "pt" => "Vidros Insonorizantes e Atérmicos",
      "en" => "Soundproofing and Athermic"
  ]
];

array_walk($data, function($v, $k) {echo "$v[pt]\n";});

foreach($array['options'] as $key => $val){
    echo $val['pt'];
}

$json = '{"options": {
            "front-electric": {
                "pt": "Vidros Eléctricos dianteiros",
                "en": "Front electric"
            },
            "electric-diant-back": {
                "pt": "Vidros Eléctricos diant. + trase.",
                "en": "Electric diant. + Back."
            },
            "darkened": {
                "pt": "Vidros Escurecidos",
                "en": "Darkened"
            },
            "soundproofing-and-athermic": {
                "pt": "Vidros Insonorizantes e Atérmicos",
                "en": "Soundproofing and Athermic"
            }
        }}';
$json_array = json_decode($json,true);  

foreach($json_array as $key=>$values){

    foreach($values as $subkeys=>$subvalues){

        print $subvalues['pt'] . "<br/>";   

    }

}