$options=array(UNICODE_SINGLEBYTE=>t('Standard PHP: operations on Unicode strings are emulated on a best-effort basis. Install the <a href="%url">PHP mbstring extension</a> for improved Unicode support.',array('%url'=>'http://www.php.net/mbstring')),
UNICODE_MULTIBYTE=>t('Multi-byte: operations on Unicode strings are supported through the <a href="%url">PHP mbstring extension</a>.',array('%url'=>'http://www.php.net/mbstring')),
UNICODE_ERROR=>t('Invalid: the current configuration is incompatible with Drupal.'));