(PHP 5 >= 5.3.0, PHP 7, PHP 8)
class_alias — Creates an alias for a class
Creates an alias named alias
based on the user defined class class.
The aliased class is exactly the same as the original class.
Note: As of PHP 8.3.0, class_alias() also supports creating an alias of an PHP internal class.
classThe original class.
aliasThe alias name for the class.
autoloadWhether to autoload if the original class is not found.
| Version | Description |
|---|---|
| 8.3.0 | class_alias() now supports creating an alias of an internal class. |
Example #1 class_alias() example
<?php
class Foo { }
class_alias('Foo', 'Bar');
$a = new Foo;
$b = new Bar;
// the objects are the same
var_dump($a == $b, $a === $b);
var_dump($a instanceof $b);
// the classes are the same
var_dump($a instanceof Foo);
var_dump($a instanceof Bar);
var_dump($b instanceof Foo);
var_dump($b instanceof Bar);
?>The above example will output:
bool(true) bool(false) bool(true) bool(true) bool(true) bool(true) bool(true)
Note:
Class names are case-insensitive in PHP, and this is reflected in this function. Aliases created by class_alias() are declared in lowercase. This means that for a class
MyClass, theclass_alias('MyClass', 'MyClassAlias')call will declare a new class alias namedmyclassalias.