<restaurants>
  <restaurant>
    <name>Some restaurant name</name>
    <type>Chinese</type>
  </restaurant>
  <restaurant>
    <name>Another restaurant name</name>
    <type>Italian</type>
  </restaurant>
</restaurants>

restaurants = {array} [1]
 restaurant = {array} [2]
  0 = {array} [2]
   name = "Some restaurant name"
   type = "Chinese"
  1 = {array} [2]
   name = "Another restaurant name"
   type = "Italian"

<restaurants>
  <restaurant>
    <name>Some restaurant name</name>
    <type>Chinese</type>
  </restaurant>
</restaurants>

restaurants = {array} [1]
 restaurant = {array} [2]
  name = "Some restaurant name"
  type = "Chinese"

if ('xml'=== $format && !is_int(key($data))) {
    $data = array($data);
}

restaurants:
  restaurant:
    - name: Some restaurant name
      type: Chinese

restaurants:
  restaurant:
    name: Some restaurant name
    type: Chinese

namespace App\Model;

use Doctrine\Common\Collections\ArrayCollection;

class ApiCall
{
    public $object1;

    public function __construct()
    {
         $this->result = new ArrayCollection();
    }

    public function getObject1() { 
         return $this->object1; 
    }
    public function setObject1($object1) { 
         $this->object1 = $object1; 
    }
    public function addObject1(Object1 $object1) { 
         if ($this->object1->contains($object1)) {
             return;
         }
         $this->object1->add($object1);
    }

}

class Object1
{
    public $object2;

    public function __construct()
    {
         $this->object2 = new ArrayCollection();
    }

    public function getObject2() { 
         return $this->object2; 
    }
    public function setObject2($object2) { 
         $this->object2 = $object2;
    }

    public function addObject2(Object2 $object2) {
         if ($this->object2->contains($object2)) {
             return;
         }
         $this->object2->add($object2);
    }
}

class Object2
{
    public function getKey1() { 
         return $this->key1; 
    }
    public function setKey1($key1) { 
         $this->key1 = $key1; 
    }
    public $key1; //String

    public function getKey2() { 
         return $this->key2; 
    }
    public function setKey2($key2) { 
         $this->key2 = $key2; 
    }
    public $key2; //int

    public function getKey3() { 
         return $this->key3; 
    }
    public function setKey3($key3) { 
         $this->key3 = $key3; 
    }
    public $key3; //String

}