如何使用null coalesce运算符将语句附加到字符串？

Question

I have a string with an operator in:

echo 'abc.' . $type ?? 'no type' . 'xyz';

If $type exists I want that to be the value, if it does not, I want 'no type' to be the value.

But with the above I just get a $type undefined error. It's not defined in my example as I want 'no type' to be outputted.

Where am I going wrong?

Answer 1

Null Coalescing Operator:

echo 'abc.' . ($type ?? 'no type') . 'xyz';

or this (ternary operator)

echo 'abc.' . (isset($type) ? $type : 'no type' ) . 'xyz';