截取文本字符串

//截取文本字符串
function cutstr_html($string, $sublen){

    $string = strip_tags($string);

    $string = preg_replace ('/\n/is', '', $string);

    $string = preg_replace ('/ |　/is', '', $string);

    $string = preg_replace ('/ /is', '', $string);

    preg_match_all("/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $string, $t_string);

    if(count($t_string[0]) - 0 > $sublen) $string = join('', array_slice($t_string[0], 0, $sublen))."……";

    else $string = join('', array_slice($t_string[0], 0, $sublen));

    return $string;

}