php - Using ternary operator in echo?
Solution:
The ?? Operator in PHP is the Null Coalescing Operator:
expr1 ?? expr2;
expr1 is returned when expr1 exists and is NOT null; otherwise it returns expr2.
Since in this case expr1 is false but is set, this expression returns Boolean false.
Compare:
echo false ?? 'It is FALSE'; // won't be displayed
echo null ?? 'it is NULL'; // It will work
Echo does not output when passed Boolean false.
Answer
Solution:
as said, you're using the null coalescing operator here
It's checking if false is null
just want to add: regular vs. shorthand ternary operation
echo false ? 'yes' : 'no';
is the same as
echo false ?: 'no';
So,
echo true ?: 'no';
will output 1, as ?: essentially skips the first expression
(condition) ? expression1 : expression2