get_object_vars
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 $c->someFunction(); //displays B
?>
get_parent_class
(PHP 4, PHP 5)
get_parent_class — Recupera el nombre de la clase padre de un objeto o clase
Descripción
Recupera el nombre de la clase padre de un objeto o clase.
Parámetros
- object
-
El objeto evaluádo o nombre de la clase
Valores devueltos
Devuelve el nombre de la clase padre de la clase de la cuál object es una instancia o el nombre.
Note:
Si el objeto no tiene padre se devolverá FALSE.
Si se llama sin parámetro fuera del objeto, esta función devolverá FALSE.
Historial de cambios
| Versión | Descripción |
|---|---|
| Antes de 5.1.0 | Si se llama sin parámetro fuera del objeto, está función devolverá NULL con una advertencia. |
| Desde 5.0.0 | El parámetro object es opcional si se llama desde el método del objeto. |
| Desde 4.0.5 | Si object es una cadena devuelve el nombre de la clase padre de la clase con ese nombre. |
Ejemplos
Example #1 Usar get_parent_class()
<?php
class papá {
function papá()
{
// implementar algo lógico
}
}
class hijo extends papá {
function hijo()
{
echo "Soy hijo de " , get_parent_class($this) , "\n";
}
}
class hijo2 extends papá {
function hijo2()
{
echo "Yo también soy hijo de " , get_parent_class('hijo2') , "\n";
}
}
$foo = new hijo();
$bar = new hijo2();
?>
El resultado del ejemplo sería:
I'm dad's son I'm dad's son too
Ver también
- get_class() - Devuelve el nombre de la clase de un objeto
- is_subclass_of() - Verifica si el objeto tiene esta clase como uno de sus padres
add a note
User Contributed Notes
get_parent_class
levu
20-Apr-2011 03:36
michael at getsprink dot -- com
09-Apr-2009 07:28
This little snippet to get the inheritance tree might be useful to someone.
<?php
header("Content-Type: text/plain;");
class Top {
public function getParents($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 03:32
"'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 04:08
"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
07-Oct-2005 12:01
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 $classes;
}
Greets, Dennis
?>
matt-php at DONT-SPAM-ME dot bitdifferent dot com
01-Nov-2004 03:52
PHP (4 at least, dunno about 5) stores classnames in lower case, so:
<?PHP
class Foo
{
}
class Bar extends Foo
{
}
echo get_parent_class('Bar');
echo "\n";
echo get_parent_class('bar');
?>
will output:
foo
foo
radu dot rendec at ines dot ro
07-Apr-2004 01:44
If the argument obj is a string and the class is not defined, then the function returns FALSE.
If the argument obj is an object created from a class with no ancestors (or a string representing a class with no ancestors), then the function returns FALSE.
tim at correctclick dot com
06-Apr-2003 03:48
A slightly more cryptic but faster get_ancestors function:
function get_ancestors ($class) {
for ($classes[] = $class; $class = get_parent_class ($class); $classes[] = $class);
return $classes;
}
(The second part of the for is implicitly testing for $class != ""). Recursion is considerably slower than looping, so you probably want to use this function.
Hope someone finds it useful.
eric dot brison at anakeen dot com
28-Jan-2002 12:14
To return all ancestors class of an object
function get_ancestors_class($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
)