如何在PHP的前20个单词中截断字符串？

function limit_text($text, $limit) {      if (str_word_count($text, 0) > $limit) {          $words = str_word_count($text, 2);          $pos = array_keys($words);          $text = substr($text, 0, $pos[$limit]) . '...';      }      return $text;    }echo limit_text('Hello here is a long sentence blah blah blah blah blah hahahaha haha haaaaaa', 5);

输出：

Hello here is a long ...