Omitting the second part of the ternary operator

Question

Given the following expression:

$att['menutext'] = isset($attrib_in['i_menu_text']) ? : $this->getID();

If it evaluates to true, will $att['menutext'] be set to true or $this->getID()?

Answer 1

Yes, in version 5.3+ the middle expression is optional and returns true.

$a = (true ? : 1); // $a evaluates to true.
$a = (false ? : 1); // $a evaluates to 1.