The comments in the following code show what I am trying to accomplish, which is something very simple: I want to be able to refer to the name of the parent class using a PHP built-in constant (or other construct) such as __CLASS__, but which refers to the parent class rather than the current class (e.g. parent::__CLASS__) (also, while the code does not show it, if I have a subsubclass, then within such class I want to be able to refer t the parent class via something like parent::parent::__CLASS__ if at all possible).
class ParentClass {
protected $foo;
function __construct() {
$this->foo = "hello";
}
}
class DerivedClass extends ParentClass {
public $bar;
public $baz;
function __construct($bar) {
// I want to be able to write
// something like parent:__CLASS__
// here in place of 'ParentClass'
// so that no matter what I rename
// the parent class, this line will
// always work. Is this possible?
// if (is_a($bar, parent::__CLASS__)) {
if (is_a($bar, 'ParentClass')) {
$this->bar = $bar;
} else {
die("Unexpected.");
}
$this->baz = "world";
}
public function greet() {
return $this->bar->foo . " " . $this->baz;
}
}
$d = new DerivedClass(new ParentClass());
echo $d->greet();
OUTPUT:
hello world
You need get_parent_class Function to do it.
function __construct($bar) {
$parent = get_parent_class($this);
if (is_a($bar, $parent)) {
$this->bar = $bar;
} else {
die("Unexpected.");
}
$this->baz = "world";
}
if you need further level down you can use:
class subDerivedClass extents DerivedClass{
$superParent = get_parent_class(get_parent_class($this));
}