当有 space 时，使介绍文章中断返回的方法

Question

我想为文章介绍制作一种方法，该方法会在 space、逗号、句号、分号、问号或感叹号处打断返回的文本。我被困在这段代码中：

  function getIntro($count = 200) {
        return substr(strip_tags($this->content), 0, $count) . '...';
    }

请告诉我如何使用我的函数做到这一点？

Answer 1

function splitAtBlank($string, $tryToSplitAt){
    $string = substr($string, 0, $tryToSplitAt);

    $i = strlen($string);
    $i--;
    while($string[$i] != " " && $i > 0){
        $i--;
    }

    return substr($string, 0, $i);
}

那你就可以简单地使用它了:

echo splitAtBlank("Your string", 8);

为了您的目的：

function getIntro($count = 200) {
    $string = substr(strip_tags($this->content), 0, $count);

    $i = strlen($string);
    $i--;
    while($string[$i] != " " && $i > 0){
        $i--;
    }

    return substr($string, 0, $i) . '...';
}

还有另一个处理多个分隔符的版本：

function getIntro($count = 200){
    $chars = array(' ', '.', ',', '!', '?');
    $string = substr(strip_tags($this->content), 0, $count);
    $i = strlen($string) - 1;
    while(!in_array($string[$i], $chars) && $i > 0){
        $i--;
    }
    return substr($string, 0, $i) . '...';
}

如果您的文章中有一些 HTML 标签，您应该在拆分之前使用 strip_tags()。如果你需要处理标签 open/closed 状态评论这个 post.

Answer 2

如果要查找位置 200 之前最近的 space、逗号、句点、分号、问号或感叹号，则必须查找所有这些并获得可用文本的最大部分.

因此，如果您的文字是：

$text='"It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout? The point of using Lorem Ipsum is that it has a more-or-less normal distribution", i wish my function will make intro stop at word normal, rather than stop at word distribu and then cut,it';

   //cut the string at 200

$cut_text=substr($text,0,200);

   //look for all these characters.
   //strripos returns the position of the last occurrance of the character

$needles=array(' ','.',',','?','!',';');
foreach($needles as $needle){
    $pos[]=strripos($cut_text,$needle);
    }

   //sort the array to get the biggest 'position'. The biggest is $pos[0]

rsort($pos);

  //look if there is found a match, if not: just take the 200 characters

if(empty($pos[0])){$result=$cut_text;}
else{
    $result=substr($cut_text,0,$pos[0]);
    }
echo $result;

在示例中，它在

之后立即剪切文本

more-or-less normal

当有 space 时，使介绍文章中断返回的方法

Method to make intro article break the returned when there's a space

php

function