Check if variable is set and then echo it without repeating?

Question

Is there a concise way to check if a variable is set, and then echo it without repeating the same variable name?

Instead of this:

Answer 1

The closest you can get to what you are looking for is using short form of ternary operator (available since PHP5.3)

echo $a ?: "not set"; // will print $a if $a evaluates to `true` or "not set" if not

But this will trigger "Undefined variable" notice. Which you can obviously suppress with @

echo @$a ?: "not set";

Still, not the most elegant/clean solution.

So, the cleanest code you can hope for is

echo isset($a) ? $a: '';