class human{
public $name = "leo";
public $age = "25";
public function __construct($name,$age){
$this->name=$name;
$this->age=$age;
}
}
means that when this human is instantiated, if no parameters are given, use leo, 25.
found that do not, instantiation must be given a value.
$x = new human ();
wants to use the default name=leo age=25, but can"t!