The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not null; otherwise it returns its second operand.
// Fetches the value of $_GET['status']
// and returns 'no status defined' if it does not exist.
$status = isset($_GET['status']) ? $_GET['status'] : 'no status defined';
// Example 1 : With the null coalescing operator
$status = $_GET['status'] ?? 'no status defined';
$this->showOutput(__FUNCTION__ . " - example 1", $status);
// Example 2 : With the null coalescing assignment operator it can even be more simplified:
$_GET['status'] ??= 'no status defined';
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