Question

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Immediately executing anonymous functions

I want to immediately evaluate an anonymous function rather than it appearing as a Closure object in method args. Is this possible?

For example:

$obj = MyClass;
$obj->Foo(function(){return "bar";}); // passes a Closure into Foo()
$obj->Foo(function(){return "bar";}()); // passes the string "bar" into Foo()?

The 3rd line is illegal syntax — is there any way to do this?

Thanks

Answer 1

You could do it with call_user_func … though that might be a bit silly when you could just assign it to a variable and subsequently invoke the variable.

call_user_func(function(){ echo "bar"; });

You might think that PHP 5.4 with it’s dereferencing capabilities would make this possible. You’d be wrong, however (as of RC6, anyway).