Curly Braces Notation in PHP

Question

I was reading source of OpenCart and I ran into such expression below. Could someone explain it to me:

$quote = $this->{\'model_shipping_\' . $result[\'co         


        

Answer 1

Curly braces are used to explicitly specify the end of a variable name.

https://stackoverflow.com/a/1147942/680578

http://php.net/manual/en/language.types.string.php#language.types.string.parsing.complex