What is the essence of the design, how to understand it?

Question

Yii

There is the following construction: I want to understand .. just to understand what it is and how it works.
$target->{$this->leftAttribute}

Answer 1

do not read the man - just create a question on the toaster!
php.net/manual/en/language.types.string.php#langua...
php.net/manual/en/language.variables.variable.php
ideone.com/G0UZHD so clear?

Answer 2

It is considered $this->leftAttribute. For example, this would be foo_bar. Replaced {$this->leftAttribute}with foo_bar. It turns $target->foobarout - an appeal to the property by name.