function NoHTML($string) {
    $string = preg_replace("'<script[^>]*?>.*?</script>'si", "", $string);
    $string = preg_replace("'<[\/\!]*?[^<>]*?>'si", "", $string);
    $string = preg_replace("'([\r\n])[\s]+'", "", $string);
    $string = mb_ereg_replace('^(　| )+', '', $string);
    $string = mb_ereg_replace('(　| )+$', '', $string);
    $string = preg_replace("'&(quot|#34);'i", "", $string);
    $string = preg_replace("'&(amp|#38);'i", "", $string);
    $string = preg_replace("'&(lt|#60);'i", "", $string);
    $string = preg_replace("'&(gt|#62);'i", "", $string);
    $string = preg_replace("'&(nbsp|#160);'i", "", $string);
    return $string;
}

<?=NoHTML($navinfo['你的字段'])?>