Calling anonymous functions in a PHP class

Question

class Foo
{
    public $abc;

    function __construct() {
        $this->abc = function(){
            echo "new function";
        };
    }

    function Bar()
    {
        echo "This is Bar";
    }
}

$foo = new Foo();
$foo->Bar();  // echo "This is Bar"

How can I call the $abc variable function from the outside?

$foo->abc() doesn't work?

Niet the Dark Absol
– Niet the Dark Absol

2014-06-03 16:03:21 +00:00
Commented Jun 3, 2014 at 16:03 — Niet the Dark Absol
– Niet the Dark Absol, Commented Jun 3, 2014 at 16:03
^--« Seems like that comment is being contradicted.

Funk Forty Niner
– Funk Forty Niner

2014-06-03 16:05:58 +00:00
Commented Jun 3, 2014 at 16:05 — Funk Forty Niner
– Funk Forty Niner, Commented Jun 3, 2014 at 16:05
@NiettheDarkAbsol: Sadly, nope. eval.in/158339

gen_Eric
– gen_Eric

2014-06-03 16:06:40 +00:00
Commented Jun 3, 2014 at 16:06 — gen_Eric
– gen_Eric, Commented Jun 3, 2014 at 16:06

gen_Eric · Accepted Answer · 2014-06-03 16:06:21Z

6

abc isn't a method of Foo, so you can't just do $foo->abc();. abc is a property. You first need to get the property, then call it.

$abc = $foo->abc;
$abc();

DEMO: https://eval.in/158342

answered Jun 3, 2014 at 16:06

gen_Eric

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4 Comments

gen_Eric Over a year ago

@Fred-ii-: I had this same issue a while ago, so I wanted to throw in my knowledge ;)

Drumbeg Over a year ago

Nice and clear. Prefer this to the 'call_user_func' solution (+1 for both).

Funk Forty Niner Over a year ago

(Previous) experience pays off then ;-)

gen_Eric Over a year ago

@kingkero: I think doing $this->abc = function() is more ugly ;) If you want to add a method to a class, then do that. I don't think you need a anonymous function. That's what's causing the ugliness :)

Korikulum · Accepted Answer · 2015-07-29 19:14:34Z

4

Alternatively, you can use call_user_func:

call_user_func($foo->abc);

As of PHP 7 you can do the following:

($foo->abc)();

edited Jul 29, 2015 at 19:14

answered Jun 3, 2014 at 16:04

Korikulum

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