[RFC] [DISCUSSION] Improve null-coalescing operator (??) adding empty check (??:)

Related with Request #75833 https://bugs.php.net/bug.php?id=75833 From PHP 7 null-coalescing operator is a great option to avoid a previous exists check with isset. But I think that this comaparison can be improved adding a ternary operator like ??: and check also empty values. Example: -------------------------------------- <?php $foo = ''; // Current response with ternary operator echo $foo ?: 'default'; // 'defaut' // Current response with null-coalescing operator echo $foo ?? 'default'; // '' // Possible response with ternary null-coalescing operator echo $foo ??: 'default'; // 'defaut' // Same response with current PHP available code echo (isset($foo) && $foo) ? $foo : 'default'; // 'default' /** ------------------------------- **/ $foo = false; // Current response with ternary operator echo $foo ?: 'default'; // 'defaut' // Current response with null-coalescing operator echo $foo ?? 'default'; // false // Possible response with ternary null-coalescing operator echo $foo ??: 'default'; // 'defaut' // Same response with current PHP available code echo (isset($foo) && $foo) ? $foo : 'default'; // 'default' /** ------------------------------- **/ $foo = null; // Current response with ternary operator echo $foo ?: 'default'; // 'defaut' // Current response with null-coalescing operator echo $foo ?? 'default'; // 'defaut' // Possible response with ternary null-coalescing operator echo $foo ??: 'default'; // 'defaut' // Same response with current PHP available code echo (isset($foo) && $foo) ? $foo : 'default'; // 'default' /** ------------------------------- **/ unset($foo); // Current response with ternary operator echo $foo ?: 'default'; // PHP Notice:  Undefined variable: foo // Current response with null-coalescing operator echo $foo ?? 'default'; // 'defaut' // Possible response with ternary null-coalescing operator echo $foo ??: 'default'; // 'defaut' // Same response with current PHP available code echo (isset($foo) && $foo) ? $foo : 'default'; // 'default' -------------------------------------- What about? Thanks! Lito.