如果空格前的单词大于3个字符，如何在三个句点后添加<br>s

Question

我有以下示例字符串：

$string = "Mr.Bean said: It must be great to know PHP. 
He added that IP 1.2.3.4 is the best IP address one could own. 
Mrs. Walter. Today is a wonderful day. Tomorrow, it will rain. 
This is really just some random text. Did you hear this singing bird? 
I visited Berlin yesterday. It was raining and Mr. Bean said hello. 
Mrs. Bean was also there. They have two kids.";

我需要的是一种方法，每次在字符串中有三个点时，添加两个br(换行)，同时确保不添加br's，如果点前的单词小于4个字符，那么它就不会分割像Dr. .Dr..

基于上面的字符串，我要寻找的结果是：

    Mr.Bean said: It must be great to know PHP. He added that IP 1.2.3.4 is the best IP address one could own. Mrs. Walter. 

    Today is a wonderful day. Tomorrow, it will rain. This is really just some random text. 

    Did you hear this singing bird? I visited Berlin yesterday. It was raining and Mr. Bean said hello. Mrs. Bean was also there. 

    They have two kids.

所以我要找的基本上是一个函数，比如：

$string = SplitString($string);

这将照顾到我正在寻找的格式。

更新：

发布的解决方案可以正常工作，但域名也是分开的。

它显示问题的示例字符串：

    Bill Price reveals his new method for playing the diatonic harmonica, whereby anyone can convert their ordinary ten-hole diatonic harmonicas into lead instruments. “Coupling is a patented method; guaranteed to expand the harmonica's range and over-all capability.” The major key diatonic coupling formula for this method is disclosed at: http://example.com/. You’ll enjoy samples from Bill’s unique ten-song CD, “Taking the Lead”. This CD displays dynamic possibilities available when pairing/coupling two diatonic harmonicas together. The result is truly astonishing! The formula is free for visiting example.com. The CD is only $8, plus it can be used as a tutorial for learning the Coupling Method.

这个片段像这样分开了：

    Bill Price reveals his new method for playing the diatonic harmonica, whereby anyone can convert their ordinary ten-hole diatonic harmonicas into lead instruments. “Coupling is a patented method; guaranteed to expand the harmonica's range and over-all capability.” The major key diatonic coupling formula for this method is disclosed at: http://example.

    com/. You’ll enjoy samples from Bill’s unique ten-song CD, “Taking the Lead”. This CD displays dynamic possibilities available when pairing/coupling two diatonic harmonicas together.

    The result is truly astonishing! The formula is free for visiting example.com. The CD is only $8, plus it can be used as a tutorial for learning the Coupling Method.

除此之外，它似乎工作得很完美！也许诀窍是检查点后是否有空格，以防止域被分割？

Answer 1

$string = "Mr.Bean said: It must be great to know PHP. He added that IP 1.2.3.4 is the best IP address one could own. Mrs. Walter. Today is a wonderful day. Tomorrow, it will rain. This is really just some random text. Did you hear this singing bird? I visited Berlin yesterday. It was raining and Mr. Bean said hello. Mrs. Bean was also there. They have two kids.";
function splitString($str)
{
    //look for 2 full stops, then another full stop with at least 4 word characters in front of it
    preg_match_all('#(.+?\..+?\..+?\w{4,}\.)#',$str,$matches);
    return implode('<br><br>',array_map('trim',$matches[1]));
}
echo splitString($string);

输出：

Mr.Bean said: It must be great to know PHP. He added that IP 1.2.3.4 is the best IP address one could own. Mrs. Walter.

Today is a wonderful day. Tomorrow, it will rain. This is really just some random text.

Did you hear this singing bird? I visited Berlin yesterday. It was raining and Mr. Bean said hello.

Mrs. Bean was also there. They have two kids.

确保在句号结束后立即没有内容的新版本：

$string = " Bill Price reveals his new method for playing the diatonic harmonica, whereby anyone can convert their ordinary ten-hole diatonic harmonicas into lead instruments. Coupling is a patented method; guaranteed to expand the harmonica's range and over-all capability. The major key diatonic coupling formula for this method is disclosed at: http://example.com/. You'll enjoy samples from Bill's unique ten-song CD, Taking the Lead. This CD displays dynamic possibilities available when pairing/coupling two diatonic harmonicas together. The result is truly astonishing! The formula is free for visiting example.com. The CD is only $8, plus it can be used as a tutorial for learning the Coupling Method.";
function splitString($str)
{
    preg_match_all('#(.+?\..+?\..+?\w{4,}\.($| ))#',$str,$matches);
    return implode('<br><br>',array_map('trim',$matches[1]));
}
echo splitString($string);

输出：

Bill Price reveals his new method for playing the diatonic harmonica, whereby anyone can convert their ordinary ten-hole diatonic harmonicas into lead instruments. Coupling is a patented method; guaranteed to expand the harmonica's range and over-all capability. The major key diatonic coupling formula for this method is disclosed at: http://example.com/. You'll enjoy samples from Bill's unique ten-song CD, Taking the Lead.

This CD displays dynamic possibilities available when pairing/coupling two diatonic harmonicas together. The result is truly astonishing! The formula is free for visiting example.com. The CD is only $8, plus it can be used as a tutorial for learning the Coupling Method.

Answer 2

这可以实现您想要的结果，但是输出与您所期望的不同(请看ma，没有regex)：

function splitString($string) {
    $pieces = explode(".", $string); // Split string into array at each "."
    $count = count($pieces);
    $tally = 0;
    for ($i = 0; $i < $count - 1; $i++) { // Loop through each piece ignoring the last as it doesn't make sense to put a "<br />" after it.
       $piece = $pieces[$i];
       $words = explode(" ", $piece);
       if (strlen(trim($words[count($words)-1])) > 3) { // Check whether the last word in this piece is greater than 3 characters long
          $tally++;
          if ($tally % 3 == 0) { 
            $pieces[$i + 1] = '<br />' . ltrim($pieces[$i + 1]); // Prepend "<br />" to next piece and remove any preceding whitespace
          }
       }
       $pieces[$i] .= ".";
    }
    return implode($pieces); // Put pieces into a string
}

输出

Mr.Bean said: It must be great to know PHP. He added that IP 1.2.3.4 is the best IP address one could own. Mrs. Walter. Today is a wonderful day. Tomorrow, it will rain. This is really just some random text.<br>Did you hear this singing bird? I visited Berlin yesterday. It was raining and Mr. Bean said hello. Mrs. Bean was also there.<br>They have two kids.

它检测到与您的标准匹配的下列单词：

• 沃尔特
• 下雨
• 文本
• 昨天
• 你好
• 那里
• 孩子们

Answer 3

试试这个：

$string =<<<EOD

Mr.Bean说:一定很棒.了解PHP。他补充说，IP 1.2.3.4是我们能拥有的最好的IP地址。沃尔特太太。今天是美好的一天。明天会下雨。这真的只是一些随机的文字。你听到这只唱歌的鸟了吗？我昨天去了柏林。..。天在下雨，比恩先生向他问好。比恩夫人也在场..。他们有两个孩子。EOD；

echo str_replace(“.”)

"，$string)；

如果你想知道更多：http://php.net/manual/en/function.str-replace.php

对于最佳实践，尝试使用Heredoc语法声明变量($string)：http://php.net/manual/en/language.types.string.php