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config/custom.php加上我這個函數，用我的函數

if (!function_exists('dr_en_strcut')) {
    function dr_en_strcut($str, $limit = '100', $dot = '...') {
        if (!$str) {
            return '';
        }
        $start = 0;
        if ($limit && strpos((string)$limit, ',')) {
            list($start, $length) = explode(',', $limit);
            $length = (int)$length;
        } else {
            $length = (int)$limit;
        }
        if (strlen($str) <= $length || !$length) {
            return $str;
        }
        $res = substr($str, $start, $length);
        $strlen = strlen($str);
        if ($start >= 0) {
            $next_start = $start + $length;
            $next_len = $next_start + 6 <= $strlen ? 6 : $strlen - $next_start;
            $next_segm = substr($str, $next_start, $next_len);
            $prev_start = $start - 6 > 0 ? $start - 6 : 0;
            $prev_segm = substr($str, $prev_start, $start - $prev_start);
        }  else {
            $next_start = $strlen + $start + $length;
            $next_len = $next_start + 6 <= $strlen ? 6 : $strlen - $next_start;
            $next_segm = substr($str, $next_start, $next_len);
            $start = $strlen + $start;
            $prev_start = $start - 6 > 0 ? $start - 6 : 0;
            $prev_segm = substr($str, $prev_start, $start - $prev_start);
        }
        if (preg_match('@^([x80-xBF]{0,5})[xC0-xFD]?@', $next_segm, $bytes)) {
            if (!empty($bytes[1])) {
                $bytes = $bytes[1];
                $res .= $bytes;
            }
        }
        $ord0 = ord($res[0]);
        if (128 <= $ord0 && 191 >= $ord0) {
            if (preg_match('@[xC0-xFD][x80-xBF]{0,5}$@', $prev_segm, $bytes)) {
                if (!empty($bytes[0])) {
                    $bytes = $bytes[0];
                    $res = $bytes . $res;
                }
            }
        }
        if (strlen($res) < $strlen) {
            $res = $res . $dot;
        }
        return $res;
    }
}