array(7) {
  ["pa_materiales"]=>
  object(WC_Product_Attribute)#39325 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(1)
      ["name"]=>
      string(13) "pa_materiales"
      ["options"]=>
      array(1) {
        [0]=>
        int(86)
      }
      ["position"]=>
      int(0)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["pa_color"]=>
  object(WC_Product_Attribute)#39324 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(3)
      ["name"]=>
      string(8) "pa_color"
      ["options"]=>
      array(1) {
        [0]=>
        int(77)
      }
      ["position"]=>
      int(1)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["pa_marca"]=>
  object(WC_Product_Attribute)#39263 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(4)
      ["name"]=>
      string(8) "pa_marca"
      ["options"]=>
      array(1) {
        [0]=>
        int(139)
      }
      ["position"]=>
      int(2)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["pa_temperatura-recomenda"]=>
  object(WC_Product_Attribute)#39327 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(7)
      ["name"]=>
      string(24) "pa_temperatura-recomenda"
      ["options"]=>
      array(1) {
        [0]=>
        int(93)
      }
      ["position"]=>
      int(3)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["pa_codigo-relacionados-forma"]=>
  object(WC_Product_Attribute)#39236 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(2)
      ["name"]=>
      string(28) "pa_codigo-relacionados-forma"
      ["options"]=>
      array(1) {
        [0]=>
        int(64)
      }
      ["position"]=>
      int(4)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["tamano-largo-ancho-mm-alto-cm"]=>
  object(WC_Product_Attribute)#39328 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(0)
      ["name"]=>
      string(32) "Tamaño (Largo-Ancho mm-Alto cm)"
      ["options"]=>
      array(1) {
        [0]=>
        string(20) "15.70 x 13.30 x 1.40"
      }
      ["position"]=>
      int(5)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
  ["peso-gr"]=>
  object(WC_Product_Attribute)#39322 (1) {
    ["data":protected]=>
    array(6) {
      ["id"]=>
      int(0)
      ["name"]=>
      string(9) "Peso (gr)"
      ["options"]=>
      array(1) {
        [0]=>
        string(4) "6.60"
      }
      ["position"]=>
      int(6)
      ["visible"]=>
      bool(true)
      ["variation"]=>
      bool(true)
    }
  }
}

-----NULL

xxxxstring(13) "pa_materiales" bool(true)

xxxxstring(8) "pa_color" bool(true)

xxxxstring(8) "pa_marca" bool(true)

xxxxstring(24) "pa_temperatura-recomenda" bool(true)

xxxxstring(28) "pa_codigo-relacionados-forma" bool(true)

xxxxstring(32) "Tamaño (Largo-Ancho mm-Alto cm)" bool(false)

xxxxstring(9) "Peso (gr)" bool(false)