Online PHP editor | refs for WLQ0D

<?php echo "Non-existent: ", json_encode(!isset($var) || !($var || (is_scalar($var) && strlen($var)))), "\n"; $values = [null, false, true, 0, 100, "", "string", [], [0]]; foreach ($values as $var) { echo json_encode($var), ": ", json_encode(!isset($var) || !($var || (is_scalar($var) && strlen($var)))), "\n"; }