php - UTF-8 兼容截断函数

Question

有人遇到过复杂拉丁字符(例如越南语)的这个问题吗？

    function truncate($str, $length, $append = '…') {
      $strLength = mb_strlen($str);

      if ($strLength <= $length) {
         return $str;
      }

      return mb_substr($str, 0, $length) . $append;
    }

echo truncate('Bà Rịa - Vũng Tàu!', 14);

输出:

Bà Rịa - V...

http://codepad.viper-7.com/GOZFB0

我需要一些帮助来切入角色，但我什至不确定这里的幕后发生了什么。

Answer 1

你可以使用 mb_strimwidth (PHP 文档):

echo mb_strimwidth("Hello World", 0, 10, "...");

---

或者像Multibyte String Truncate for Smarty这样的自定义函数:

mb_truncate($string, $length = 80, $etc = '...', $charset='UTF-8',
                                  $break_words = false, $middle = false)
{
    if ($length == 0)
        return '';

    if (strlen($string) > $length) {
        $length -= min($length, strlen($etc));
        if (!$break_words && !$middle) {
            $string = preg_replace('/\s+?(\S+)?$/', '', mb_substr($string, 0, $length+1, $charset));
        }
        if(!$middle) {
            return mb_substr($string, 0, $length, $charset) . $etc;
        } else {
            return mb_substr($string, 0, $length/2, $charset) . $etc . mb_substr($string, -$length/2, $charset);
        }
    } else {
        return $string;
    }
}