PHP List - Explode

class Dog
{
private int $dog_weight = 0;
private string $dog_breed = "no breed";
private string $dog_color = "no color";
private string $dog_name = "no name";
private string $o; // used for output work
function display_properties()
{
$o = "Dog weight is $this->dog_weight. Dog breed is $this->dog_breed. Dog color is $this->dog_color.";
wro($o);
}
function get_properties() : string
{
return "$this->dog_weight,$this->dog_breed,$this->dog_color";
}
function speak()
{
echo 'bark bark bark!';
}
}
$dog_properties = $chow->get_properties();
list($dog_weight, $dog_breed, $dog_color) = explode(',',$dog_properties );
print "Dog weight is $dog_weight. Dog breed is $dog_breed. Dog Color is $dog_color" ;