php - Ternary Operators. Possible for a one sided action?

Question

I've used ternary operators for a while and was wondering if there was a method to let say call a function without the else clause. Example:

if (isset($foo)) {
    callFunction();
} else {

}

Now obviously we can leave out the else to make:

if (isset($foo)) {
    callFunction();
}

Now for a ternary How can you 'by pass' the else clause if the condition returns false?

isset($foo) ? callFunction() : 'do nothing!!';

Either a mystery or not possible?

Answer 1

Short-circuit

isset($foo) and callFunction();

Reverse the condition and omit the second argument

!isset($foo) ?: callFunction();

or return just "something"

isset($foo) ? callFunction() : null;

However, the ternary operators is designed to conditionally fetch a value out of two possible values. You are calling a function, thus it seems you are really looking for if and misuse ?: to save characters?

if (isset($foo)) callFunction();