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References: <4856A547.3080801@gmx.net> <4856B752.1040500@gmx.net>	 <200806162257.24141.larry@garfieldtech.com> <7dd2dc0b0806162257t15f679c1t2d9e77221144f340@mail.gmail.com>
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Subject: Re: [PHP-DEV] [PATCH] [RFC] Closures and lambda functions in PHP
From: chris_se@gmx.net (Christian Seiler)

Hi!

> 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
>       }
>   }
> }
> 
> /// invoking dynamically added methods
> /// (anticipated behavior given above definitions)
> $dynamic->addMethodAtRuntime();
> echo $dynamic->dynamicFunc1(); // 5

This will not work - for the same reason as this does not work:

class SpecialChars {
   public $process = 'htmlspecialchars';
}

$sc = new SpecialChars ();
var_dump ($sc->process ('<>')); // call to undefined ...

On the other hand, the following will work:

$sc = new SpecialChars ();
$processor = $sc->process;
var_dump ($processor ('<>')); // string(8) "&lt;&gt;"

The same with closures:

echo $dynamic->dynamicFunc1(); // call to undefined ...
$func = $dynamic->dynamicFunc1;
echo $func (); // 5
echo call_user_func ($dynamic->dynamicFunc1); // 5

As I sead in my other mail: I don't see closures as a method for somehow
making it possible to extend classes dynamically - if you want that, use
runkit.

Regards,
Christian