"calling closure assigned to object property directly" Answer’s


As of PHP7, you can do

$obj = new StdClass;
$obj->fn = function($arg) { return "Hello $arg"; };
echo ($obj->fn)('World');

or use Closure::call(), though that doesn't work on a StdClass.

Before PHP7, you'd have to implement the magic __call method to intercept the call and invoke the callback (which is not possible for StdClass of course, because you cannot add the __call method)

class Foo
    public function __call($method, $args)
        if(is_callable(array($this, $method))) {
            return call_user_func_array($this->$method, $args);
        // else throw exception

$foo = new Foo;
$foo->cb = function($who) { return "Hello $who"; };
echo $foo->cb('World');

Note that you cannot do

return call_user_func_array(array($this, $method), $args);

in the __call body, because this would trigger __call in an infinite loop.

Wednesday, March 31, 2021
answered 11 Months ago
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