Executing functions inside string

Everyone knows in PHP you can do this:

$m = "my string is {$string}";

But is taht possibile with function too? Like:

$m = "my string is {getStringValue()}";

The string expansion in {$..} goes a bit beyond just being able to execute functions. I for example used gettext with that. But you can also use tricks like that:

$html = "htmlentities";    // any callback function
// or just: $html = function($s){ return $s; }

print "even allows expressions {$html(2+3*5+rand(2,17))} here";

That's possible because PHP allows any variable expression there in order to support the simple object notation case:

print "this isn't just a {$obj->prop} string variable";

And for example I'm utilizing an object which implements ArrayAccess, where even this is a method invocation:

print "Makes some things {$_GET->ascii->html['input']} simpler";

We had a few such topics on SO, but for the life of me I can't find a good reference ...

This is not possible (and it wouldn't be very readable too, especially if the function had parameters).

You could use sprintf:

 $m = sprintf("my string is %s", getStringValue());

Only variable names are expanded http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.double

With concatenation, If I understand well what you're trying to do:

$m = "my string is {".getStringValue()."}";