你可以用这个:

function word_shortener($text, $words=10, $sp='...'){

  $all = explode(' ', $text);
  $str = '';
  $count = 1;

  foreach($all as $key){
    $str .= $key . ($count >= $words ? '' : ' ');
    $count++;
    if($count > $words){
      break;
    }
  }

  return $str . (count($all) <= $words ? '' : $sp);

}

例子:

word_shortener("Hello world, this is a text", 3); // Hello world, this...
word_shortener("Hello world, this is a text", 3, ''); // Hello world, this
word_shortener("Hello world, this is a text", 3, '[read more]'); // Hello world, this[read more]

Edit

工作原理:

1. 从输入文本中打开空格:

$all = explode(' ', $text);

例如，如果$text将是"Hello world"，那么$all是一个带有爆炸值的数组:

“你好”,“世界”)

2. 对于每个单词:

选择展开文本中的每个元素:

foreach($all as $key){...

将当前单词($key)附加到$str，如果它是最后一个单词，则添加空格:

$str .= $key . ($count >= $words ? '' : ' ');

然后给$count加上1，检查它是否大于max limit($words)打破循环:

if($count > $words){
   break;
}

只有当最终文本小于输入文本时，才返回$str和分隔符($sp):

return $str . (count($all) <= $words ? '' : $sp);

你可以用这个:

function word_shortener($text, $words=10, $sp='...'){

  $all = explode(' ', $text);
  $str = '';
  $count = 1;

  foreach($all as $key){
    $str .= $key . ($count >= $words ? '' : ' ');
    $count++;
    if($count > $words){
      break;
    }
  }

  return $str . (count($all) <= $words ? '' : $sp);

}

例子:

word_shortener("Hello world, this is a text", 3); // Hello world, this...
word_shortener("Hello world, this is a text", 3, ''); // Hello world, this
word_shortener("Hello world, this is a text", 3, '[read more]'); // Hello world, this[read more]

Edit

工作原理:

1. 从输入文本中打开空格:

$all = explode(' ', $text);

例如，如果$text将是"Hello world"，那么$all是一个带有爆炸值的数组:

“你好”,“世界”)

2. 对于每个单词:

选择展开文本中的每个元素:

foreach($all as $key){...

将当前单词($key)附加到$str，如果它是最后一个单词，则添加空格:

$str .= $key . ($count >= $words ? '' : ' ');

然后给$count加上1，检查它是否大于max limit($words)打破循环:

if($count > $words){
   break;
}

只有当最终文本小于输入文本时，才返回$str和分隔符($sp):

return $str . (count($all) <= $words ? '' : $sp);

我将使用preg_match函数来做到这一点，因为您想要的是一个相当简单的表达式。

$matches = array();
$result = preg_match("/^(.{1,199})[\s]/i", $text, $matches);

表达式的意思是“匹配从长度1-200开始以空格结尾的任何子字符串”。结果在$result中，匹配在$matches中。这就解决了你最初的问题，即以任意空格结束的问题。如果你想让它以换行符结束，将正则表达式更改为:

$result = preg_match("/^(.{1,199})[\n]/i", $text, $matches);

通过使用wordwrap函数。它将文本分割成多行，这样最大宽度就是您指定的宽度，在单词边界处断开。分割之后，你只需取第一行:

substr($string, 0, strpos(wordwrap($string, $your_desired_width), "\n"));

这个线性程序不能处理的一件事是，当文本本身比所需的宽度短时。为了处理这种边情况，我们应该这样做:

if (strlen($string) > $your_desired_width) 
{
    $string = wordwrap($string, $your_desired_width);
    $string = substr($string, 0, strpos($string, "\n"));
}

上面的解决方案存在一个问题，即如果文本在实际切点之前包含换行符，则会过早地切割文本。这里有一个解决这个问题的版本:

function tokenTruncate($string, $your_desired_width) {
  $parts = preg_split('/([\s\n\r]+)/', $string, null, PREG_SPLIT_DELIM_CAPTURE);
  $parts_count = count($parts);

  $length = 0;
  $last_part = 0;
  for (; $last_part < $parts_count; ++$last_part) {
    $length += strlen($parts[$last_part]);
    if ($length > $your_desired_width) { break; }
  }

  return implode(array_slice($parts, 0, $last_part));
}

另外，这里是用于测试实现的PHPUnit测试类:

class TokenTruncateTest extends PHPUnit_Framework_TestCase {
  public function testBasic() {
    $this->assertEquals("1 3 5 7 9 ",
      tokenTruncate("1 3 5 7 9 11 14", 10));
  }

  public function testEmptyString() {
    $this->assertEquals("",
      tokenTruncate("", 10));
  }

  public function testShortString() {
    $this->assertEquals("1 3",
      tokenTruncate("1 3", 10));
  }

  public function testStringTooLong() {
    $this->assertEquals("",
      tokenTruncate("toooooooooooolooooong", 10));
  }

  public function testContainingNewline() {
    $this->assertEquals("1 3\n5 7 9 ",
      tokenTruncate("1 3\n5 7 9 11 14", 10));
  }
}

编辑:

像'à'这样的特殊UTF8字符不会被处理。在REGEX的末尾添加'u'来处理它:

部分美元= preg_split (' / ([\ s \ n \ r] +) / u ',美元字符串,null, PREG_SPLIT_DELIM_CAPTURE);

我是这样做的:

$string = "I appreciate your service & idea to provide the branded toys at a fair rent price. This is really a wonderful to watch the kid not just playing with variety of toys but learning faster compare to the other kids who are not using the BooksandBeyond service. We wish you all the best";

print_r(substr($string, 0, strpos(wordwrap($string, 250), "\n")));

当我注意到wordwrap函数的$break参数时，产生了以下解决方案:

字符串$str [， int $width = 75[，字符串$break = "\n" [， bool $cut = false]])

下面是解决方案:

/**
 * Truncates the given string at the specified length.
 *
 * @param string $str The input string.
 * @param int $width The number of chars at which the string will be truncated.
 * @return string
 */
function truncate($str, $width) {
    return strtok(wordwrap($str, $width, "...\n"), "\n");
}

示例# 1。

print truncate("This is very long string with many chars.", 25);

上面的例子将输出:

This is very long string...

例# 2。

print truncate("This is short string.", 25);

上面的例子将输出:

This is short string.