call_user_method
Something to note,
If the $original class has not yet been defined or loaded, the auto loader will be invoked in order to try and load it.
If the class for which you are trying to create an alias does not exist, or can not be loaded with the auto loader, you will generate a PHP Warning.
class_alias
(PHP 5 >= 5.3.0)
class_alias — Crea un alias para una clase
Descripción
bool class_alias
([ string
$original
[, string $alias
]] )
Crea un alias dado por alias
basado en la clase definida original.
La clase apodada es exactamente la misma que la clase original.
Parámetros
-
original -
La clase original.
-
alias -
El nombre del alias para la clase.
Valores devueltos
Devuelve TRUE en caso de éxito o FALSE en caso de error.
Ejemplos
Ejemplo #1 Ejemplo de class_alias()
<?php
class foo { }
class_alias('foo', 'bar');
$a = new foo;
$b = new bar;
// los objetos son los mismos
var_dump($a == $b, $a === $b);
var_dump($a instanceof $b);
// las clases son las mismas
var_dump($a instanceof foo);
var_dump($a instanceof bar);
var_dump($b instanceof foo);
var_dump($b instanceof bar);
?>
El resultado del ejemplo sería:
bool(true) bool(false) bool(true) bool(true) bool(true) bool(true) bool(true)
Ver también
- get_parent_class() - Recupera el nombre de la clase padre de un objeto o clase
- is_subclass_of() - Verifica si el objeto tiene esta clase como uno de sus padres
add a note
User Contributed Notes
class_alias
adam at adamhahn dot com
06-Sep-2011 12:13
programmer-comfreek at hotmail dot com
15-Aug-2011 09:38
If you defined the class 'original' in a namespace, you will have to specify the namespace(s), too:
<?php
namespace ns1ns2ns3;
class A {}
class_alias('ns1\ns2\ns3\A', 'B');
/* or if you want B to exist in ns1\ns2\ns3 */
class_alias('ns1\ns2\ns3\A', 'ns1\ns2\ns3\B');
?>
nicolas dot grekas+php at gmail dot com
31-Dec-2010 01:09
At first, you might wonder that:
<?php class A {}; class_alias('A', 'B'); ?>
is equivalent to:
<?php class A {}; class B extends A {}; ?>
BUT when derivation creates a new class name - that means, you can then instantiate a new kind of objects - aliasing is just what it says: a synonym, so objects instantiated with the aliased name are of the exact same kind of objects instantiated with the non-aliased name.
See this code for example:
<?php
class A {};
class B1 extends A {};
class_alias('A', 'B2');
$b1 = new B1; echo get_class($b1); // prints B1
$b2 = new B2; echo get_class($b2); // prints A !
?>
nicolas dot grekas+php at gmail dot com
30-Dec-2010 02:41
class_alias also works for interfaces!
<?php
interface foo {}
class_alias('foo', 'bar');
echo interface_exists('bar') ? 'yes!' : 'no'; // prints yes!
?>
paul [dot] kotets [at] gmail [dot] com
03-Sep-2009 03:43
This function will appear in PHP 5.3 (at least I can use it with PHP 5.3, build Aug 7 2009 08:21:14)
For older versions of PHP I wrote the next function:
<?php
if (!function_exists('class_alias')) {
function class_alias($original, $alias) {
eval('abstract class ' . $alias . ' extends ' . $original . ' {}');
}
}
?>
Keyword 'abstract' is used for classes, which defines abstract methods.
This function is used in autoload purposes (when I extend classes), so abstract keyword doesn't broke anything for me.