Span Tags Stripped

/*prevents span tags being stripped by 'Tiny MCE Advanced'when switching from text to visual editor */
function override_mce_options($initArray) {
$opts = '*[*]';
$initArray['valid_elements'] = $opts;
$initArray['extended_valid_elements'] = $opts;
return $initArray;
} add_filter('tiny_mce_before_init', 'override_mce_options');