PHP5.3 - Lambdas and Closures

[DarkWater]

Well, I recently found out that PHP5.3 is planning to have both lambdas and closures added.  I personally think this is great news, because they make one-time use functions so much easier.

 

$sort = function ($a, $b) {
        return strcmp($a, $b);
};
usort($array, $sort); //btw I know that sort() would do probably do the same thing, this was just an example

 

Opinions?

[corbin]

Oooo nifty....  I probably won't use that much, but cool.

[DarkWater]

Oooo nifty....  I probably won't use that much, but cool.

 

There's also closures, which basically "wrap" functions (and variables), and allow calls to the functions to modify variables within the closure.  Perl has a similar construct.

[trq]

Where are we hearing this stuff?

 

I'm using 5.3 for several projects at the moment but haven't come accross anything like this.

[DarkWater]

Where are we hearing this stuff?

 

I'm using 5.3 for several projects at the moment but haven't come accross anything like this.

 

Someone developed a patch for it, and apparently PHP acknowledged it.  Check out http://us.php.net/call_user_func_array

Example #3:

<?php

$func = function($arg1, $arg2) {
    return $arg1 * $arg2;
};

var_dump(call_user_func($func, 2, 4)); /* As of PHP 5.3.0 */
// int(

?>

 

EDIT: Forgot I had the patch notice bookmarked. http://news.php.net/php.internals/38290

[Daniel0]

I've known for a long time. It's one of the accepted PHP RFCs:

http://wiki.php.net/rfc/closures

[DarkWater]

Yeah, I found out like 2 weeks ago, but I forgot to post. xD