Warning about Shorthand Form of the Ternary Operator

Question

Ternary Operator
( expression1 ) ? expression2 : expression3;
Has Obvious output

but be carefull of the Shorthand Form of the Ternary Operator
(From PHP 5.3 onwards, you can omit the second expression in the list)

( expression1 ) ?: expression3;

This code evaluates to the VALUE OF expression1 if expression1 is true;
otherwise it evaluates to the value of expression3.

See Example: https://code.sololearn.com/wUcpXw0i2iPM

Answer 1

thanks for your warning.

Answer 2

C# has another:
object1 ?? object2;

if object1 is null then object2 will be returned instead of object1. It works like this.

if(object1 != null)
return object1;
else
return object2;