Re: [PATCH] [RFC] Closures and lambda functions in PHP
| From: | Nathan Nobbe | Date: | Tue, 17 Jun 2008 05:57:12 +0000 |
| Subject: | Re: [PATCH] [RFC] Closures and lambda functions in PHP | ||
| References: | 1 2 3 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-38310@lists.php.net to get a copy of this message | ||
On Mon, Jun 16, 2008 at 9:57 PM, Larry Garfield <larry@garfieldtech.com>
wrote:
> Thoughts from a user-land denizen:
>
> - Related to that, would it then be possible to add methods to a class at
> runtime using lambda functions as the added methods? If so, how? If not,
> is
> that something that could reasonably be added here without hosing
> performance
> (or at least doing so less than stacking __call() and
> call_user_func_array()
> does)?
im curious about this as well, and i would welcome such functionality.
adding methods to class instances from within the definition of the class
seems intuitive, the $this keyword should be available, but when adding
methods via a variable which holds a handle to a class instance, well, i
wonder, would the $this keyword be available within those anonymous function
definitions?
class Dynamic {
private $someVar = 5;
/// adding a function to instances from within the class
public function addMethodAtRuntime() {
$this->dynamicFunc1 = function() {
return $this->someVar; // expected to work
}
}
}
/// adding a function to an instance externally
$dynamic = new Dynamic();
$anotherVar = 6;
$dynamic->dynamicFunc2 = function() {
lexical $anotherVar; // expected to work
return $this->someVar + $anotherVar; // would this work ?
}
/// invoking dynamically added methods
/// (anticipated behavior given above definitions)
$dynamic->addMethodAtRuntime();
echo $dynamic->dynamicFunc1(); // 5
echo $dynamic->dynamicFunc2(); // 11
-nathan