Know the JSON object name

Question

I have a JSON and need to know the name of my object and the values it has, for example:

    {"Pessoas" :
          [ 
           {"Nome": "Welson Play", "Idade":19}, 
           {"Nome": "Stephanie", "Idade":15},
           {"Nome": "João Pedro", "Idade":17}
          ] 
    }

I needed to pick up the code the name Pessoas and the values that each person has, but that without knowing the name, for example, could be Animais, Carros. This due to my table on BD the columns may vary, ie navigate by JSON.

Answer 1

You can use a foreach to iterate this object.

For example:

$jsonstring = '{"Pessoas" :
      [ 
       {"Nome": "Welson Play", "Idade":19}, 
       {"Nome": "Stephanie", "Idade":15},
       {"Nome": "João Pedro", "Idade":17}
      ] 
}';

$obj = json_decode($jsonstring);

foreach($obj as $chave => $array) {
    echo $chave;    // dá "Pessoas"
    // fazer aqui o que fôr preciso com a array $array
}

Example: https://ideone.com/u6kmv8

To read objects children objects, (nome, idade ....) you need to continue iterating. In the example above you can iterate the array and then the keys/value of each object.

In practice it takes two more loops:

foreach($obj as $chave => $array) {
    foreach($array as $index => $pessoa) {
        foreach($pessoa as $dado => $valor) {
            // neste nível estás dentro de cada objeto `{"Nome": "João Pedro", "Idade":17}`