Strange values when generating array in a dynamic object in PHP

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Strange values when generating array in a dynamic object in PHP

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#1 by (1 votes)

0

Follow this example code:

class Object{
      private $keys = [];
      private $values = [];

      public function criarArray(){
           $obj=get_object_vars($this);

           foreach($obj as $key => $value):
                $this->keys[] = $key;
           endforeach;

           return $this->keys;
       }
}

Instantiating:

$var = new Object();
$var->descricao = "valor para coluna 1";
$var->preco = 22.1;
$var->data = date("Y-m-d");

var_dump($var->criarArray());

We have this output:

array(5){
   [0]=>
   string(4) "keys"
   [1]=>
   string(5) "value"
   [2]=>
   string(9) "descricao"
   [3]=>
   string(5) "preco"
   [4]=>
   string(4) "data"
}

Anyway, where the keys came from [0] = > string (4) "keys" and [1] = > string (5) "value"? How do I delete them?

Using unset($this->keys) and unset($this->values) is not a viable option!

php objetos array dinamico

asked by anonymous 19.09.2017 / 20:19

1 answer

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score 1 · Accepted Answer

I do not know the end of the code, a way to get only the 'dynamic properties' and exclude the ones defined in the class as $keys and $values is to get the return of get_object_vars() and execute a unset() on the keys desired.

class Object{
    private $keys = [];
    private $values = [];

    public function criarArray(){
        $obj=get_object_vars($this);

        //Código adicionado:

        unset($obj['keys']);
        unset($obj['values']);

        foreach($obj as $key => $value):
            $this->keys[] = $key;
        endforeach;

        return $this->keys;
    }
}

$var = new Object();
$var->descricao = "valor para coluna 1";
$var->preco = 22.1;
$var->data = date("Y-m-d");

Output:

array (size=3)
  0 => string 'descricao' (length=9)
  1 => string 'preco' (length=5)
  2 => string 'data' (length=4)

If you want to mount a more incremental version you can take the properties defined in the body of the class and add in a new one ( privateFields ) this must be done in the constructor. Then you can make the difference between the array keys of privateFields and the dynamic properties. array_push combined with ... replace foreach.

class Object{
    private $keys = [];
    private $values = [];
    private $privateFields = [];

    public function __construct(){
        $this->privateFields = get_object_vars($this);
    }


    public function criarArray(){
        $obj = array_diff_key(get_object_vars($this), $this->privateFields);
        array_push($this->keys, ...array_keys($obj));
        return $this->keys;
    }
}

$var = new Object();
$var->descricao = "valor para coluna 1";
$var->preco = 22.1;
$var->data = date("Y-m-d");

var_dump($var->criarArray());

$var->nova = 'outro valor';
$var->nome = 'fulano';

var_dump($var->criarArray());


Saida:


array (size=8)
  0 => string 'descricao' (length=9)
  1 => string 'preco' (length=5)
  2 => string 'data' (length=4)
  3 => string 'descricao' (length=9)
  4 => string 'preco' (length=5)
  5 => string 'data' (length=4)
  6 => string 'nova' (length=4)
  7 => string 'nome' (length=4)