get_object_vars
I have been playing with parent and child class, and I used this function to determine that which one was calling an function. I for an example it if you only want your parent class to be able to make an function call:
here is my example (by the way this example was inspired by another example fund on php.net):
<?php
class Parents {
public static $status; //This is the status
protected static $idCount;
protected $id;
function __construct() {
$this->id = ++self::$idCount;
self::$status = "tmp";
}
public function run($task) {
if(get_parent_class($this) == "") {
echo 'Command issued: '.$task.'<br>';
self::$status = $task;
}
}
public function __tostring() {
return "(".__class__.")id=".$this->id." status=".self::$status."<br>";
}
}
class Child extends Parents {
function __construct() {
parent::__construct();
self::$status = "tmp";
echo "Child construct<br>";
}
public function __tostring() {
return "(".__class__.")id=".$this->id." status=".self::$status."<br>";
}
}
$parent = new Parents();
echo $parent;
$child = new Child();
echo $child;
echo get_parent_class('Child')."<br>";
$parent->run("mtk");
echo $parent;
echo $child;
$child->run("mtk1");
echo $parent;
echo $child;
?>
which will produces somethink like:
(Parents)id=1 status=tmp
Child construct
(Child)id=2 status=tmp
Parents
Command issued: mtk
(Parents)id=1 status=mtk
(Child)id=2 status=mtk
(Parents)id=1 status=mtk
(Child)id=2 status=mtk
hopes it helps some one :D
get_parent_class
(PHP 4, PHP 5)
get_parent_class — Gibt den Namen der Elternklasse eines Objektes zurück
Beschreibung
Gibt den Namen der Elternklasse eines Objekts oder einer Klasse zurück.
Parameter-Liste
- object
-
Das untersuchte Objekt oder der untersuchte Klassenname.
Rückgabewerte
Gibt den Namen der Elternklasse der Klasse zurück, von der object eine Instanz oder der Name ist.
Hinweis:
Falls das Objekt keine Elternklasse hat, wird FALSE zurückgegeben.
Falls die Funktion außerhalb eines Objekts ohne Parameter aufgerufen wird, gibt sie FALSE zurück.
Changelog
| Version | Beschreibung |
|---|---|
| Vor 5.1.0 | Falls die Funktion außerhalb eines Objekts ohne Parameter aufgerufen wird, gibt sie NULL zurück mit einer Warnung. |
| Seit 5.0.0 | Der Parameter object ist optional, falls die Funktion von einer Methode eines Objekts aufgerufen wird. |
| Seit 4.0.5 | Falls object eine Zeichenkette ist, gibt diese Funktion den Namen der Elternklasse der Klasse mit diesem Namen zurück. |
Beispiele
Beispiel #1 Die Verwendung von get_parent_class()
<?php
class vater {
function vater()
{
// implementiert etwas Logik
}
}
class kind extends vater {
function kind()
{
echo "Ich bin das Kind von " , get_parent_class($this) , "\n";
}
}
class kind2 extends vater {
function kind2()
{
echo "Ich bin ebenfalls das Kind von " , get_parent_class('kind2') , "\n";
}
}
$foo = new kind();
$bar = new kind2();
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Ich bin das Kind von vater Ich bin ebenfalls das Kind von vater
Siehe auch
- get_class() - Ermittelt den Klassennamen eines Objekts
- is_subclass_of() - Prüft ob ein Objekt von der angegebenen Klasse abstammt
add a note
User Contributed Notes
get_parent_class
Michael Torp Kaalund
07-Jun-2011 05:45
levu
20-Apr-2011 08:36
I wrote a simple function doing the reverse thing: get the children:
<?php
function get_child($instance, $classname) {
$class = $classname;
$t = get_class($instance);
while (($p = get_parent_class($t)) !== false) {
if ($p == $class) {
return $t;
}
$t = $p;
}
return false;
}
abstract class A {
function someFunction() {
return get_child($this, __CLASS__);
}
}
class B extends A {
}
class C extends B {
}
$c = new C();
echo $c->someFunction(); //displays B
?>
michael at getsprink dot -- com
09-Apr-2009 12:28
This little snippet to get the inheritance tree might be useful to someone.
<?php
header("Content-Type: text/plain;");
class Top {
public function getParents($class=null, $plist=array()) {
$class = $class ? $class : $this;
$parent = get_parent_class($class);
if($parent) {
$plist[] = $parent;
/*Do not use $this. Use 'self' here instead, or you
* will get an infinite loop. */
$plist = self::getParents($parent, $plist);
}
return $plist;
}
}
class Middle extends Top {
}
class Bottom extends Middle {
}
$o = new Bottom();
print_r($o->getParents());
?>
ssb45 at cornell dot edu
14-May-2008 08:32
"'If called without parameter outside object' What on earth does that mean?"
There are two places this could be called:
1. From within a member function of an object. In this case, it may be called with no parameters and will return the parent class of the object owning the member function. (If the parameter is included, then it will return the parent class of the specified class as normal.)
2. From outside an object (i.e., global or function scope). In this case, PHP doesn't know what class you're talking about if you don't include a parameter, so it returns FALSE. (But, of course, it works if you specify the class with the parameter.)
marcus at synchromedia dot co dot uk
16-Apr-2008 09:08
"If called without parameter outside object" What on earth does that mean?
What I can tell you, and that is not documented, is that if the object in question does not have an explicitly declared parent class, it does return boolean false. It doesn't for example return 'stdClass' on the basis that all objects are derived from that.
birkholz at web dot de
06-Oct-2005 05:01
tim at correctclick dot com wrote:
<quote>
A slightly more cryptic but faster get_ancestors function:
<?php
function get_ancestors ($class) {
for ($classes[] = $class; $class = get_parent_class ($class); $classes[] = $class);
return $classes;
}
?>
(The second part of the for is implicitly testing for $class != ""). Recursion is considerably slower than looping, so you probably want to use this function.
Hope someone finds it useful.
</quote>
I would prefer this version, because it will create no duplicates:
<?php
function get_ancestors ($class) {
$classes = array($class);
while($class = get_parent_class($class)) { $classes[] = $class; }
return $classes;
}
Greets, Dennis
?>
matt-php at DONT-SPAM-ME dot bitdifferent dot com
01-Nov-2004 07:52
PHP (4 at least, dunno about 5) stores classnames in lower case, so:
<?PHP
class Foo
{
}
class Bar extends Foo
{
}
echo get_parent_class('Bar');
echo "\n";
echo get_parent_class('bar');
?>
will output:
foo
foo
radu dot rendec at ines dot ro
07-Apr-2004 06:44
If the argument obj is a string and the class is not defined, then the function returns FALSE.
If the argument obj is an object created from a class with no ancestors (or a string representing a class with no ancestors), then the function returns FALSE.
tim at correctclick dot com
05-Apr-2003 07:48
A slightly more cryptic but faster get_ancestors function:
function get_ancestors ($class) {
for ($classes[] = $class; $class = get_parent_class ($class); $classes[] = $class);
return $classes;
}
(The second part of the for is implicitly testing for $class != ""). Recursion is considerably slower than looping, so you probably want to use this function.
Hope someone finds it useful.
eric dot brison at anakeen dot com
28-Jan-2002 04:14
To return all ancestors class of an object
function get_ancestors_class($classname) {
$father = get_parent_class($classname);
if ($father != "") {
$ancestors = get_ancestors_class($father);
$ancestors[] = $father;
}
return $ancestors;
}
example :
-----------
Class C {
}
Class B extends C {
}
Class A extends B {
}
print_r (get_ancestors_class("a"));
print_r (get_ancestors_class("b"));
example result :
---------------
Array
(
[0] => c
[1] => b
)
Array
(
[0] => c
)