Online PHP editor | output for hbI7n

<?php echo sscanf('', '%d', $num); // -1 echo "\n"; echo sscanf('foo', '%d', $num); // 0 echo "\n"; echo sscanf('411', '%d', $num); // 1 echo "\n"; echo sscanf('411', '%d%d', $num); // Fatal error: Uncaught ValueError: Different numbers of variable names and field specifiers /* echo "\n---\n"; var_export(sscanf('', '%d')); // null echo "\n"; var_export(sscanf('foo', '%d')); // [null] echo "\n"; var_export(sscanf('411', '%d')); // [411] echo "\n"; var_export(sscanf('411', '%d%d')); // [411, null] */