Req #53138 [NEW]: __instanceof magic method
From:
Operating system: N/A
PHP version: 5.3.3
Package: *General Issues
Bug Type: Feature/Change Request
Bug description:__instanceof magic method
Description:
------------
as it stands, it's possible to create a wrapper e.g.
<?php
class A {
}
class AWrapper {
protected $a;
public function __construct(A $a) {
$this->a = $a;
}
public function __set($name, $value) {
$this->a->$name = $value;
}
public function __get($name) {
return $this->a->$name;
}
public function __call($func, $args) {
return call_user_func_array(array($this->a, $func), $args);
}
}
?>
AWrapper, now mimics the interface of A. It will work as a substitute for
A, anywhere A is required.
The problem is, type checking. Anywhere class "A" is used, it may be type
hinted or checked using instanceof
e.g.
function setA(A $a) {
}
or $foo isntanceof 'A';
If an __instanceof magic method existed, it would be possible to get
around this and have true wrapper classes.
For example:
public function __instanceof() {
return 'A';
}
Or perhaps it should return an array to allow it to wrap multiple classes.
--
Edit bug report at http://bugs.php.net/bug.php?id=53138&edit=1
--
Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53138&r=trysnapshot52
Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53138&r=trysnapshot53
Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53138&r=trysnapshottrunk
Fixed in SVN: http://bugs.php.net/fix.php?id=53138&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53138&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=53138&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=53138&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=53138&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=53138&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=53138&r=support
Expected behavior: http://bugs.php.net/fix.php?id=53138&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=53138&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=53138&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=53138&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53138&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=53138&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=53138&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=53138&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=53138&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=53138&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=53138&r=mysqlcfg
Thread (3 messages)
- tom at r dot je