如何在PHP的前20个单词中截断字符串？

Question

如何在PHP中20个单词后截断字符串？

Answer 1

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 ...

Answer 2

将数字更改3为以下数字20可获得前20个字，或将其作为参数传递。下面演示了如何获取前3个字：（因此将更3改为20可以更改默认值）：

function first3words($s, $limit=3) {

    return preg_replace('/((\w+\W*){'.($limit-1).'}(\w+))(.*)/', '${1}', $s);   

}

var_dump(first3words("hello yes, world wah ha ha"));  # => "hello yes, world"

var_dump(first3words("hello yes,world wah ha ha"));   # => "hello yes,world"

var_dump(first3words("hello yes world wah ha ha"));   # => "hello yes world"

var_dump(first3words("hello yes world"));  # => "hello yes world"

var_dump(first3words("hello yes world.")); # => "hello yes world"

var_dump(first3words("hello yes"));  # => "hello yes"

var_dump(first3words("hello"));  # => "hello"

var_dump(first3words("a")); # => "a"

var_dump(first3words(""));  # => ""