字符摘录

Question

字符摘录

5

4670 2012-10-16

我在functions.php中有代码:

 function string_limit_words($string, $word_limit)
{
  $words = explode(' ', $string, ($word_limit + 1));
  if(count($words) > $word_limit)
  array_pop($words);
  return implode(' ', $words);
}

但是我需要限制摘录的字符数, 你能帮我吗?

I have code in functions.php:

function string_limit_words($string, $word_limit)
{
  $words = explode(' ', $string, ($word_limit + 1));
  if(count($words) > $word_limit)
  array_pop($words);
  return implode(' ', $words);
}

but i need to limit excerpt in number of characters, could you help me with that?

4 个回答

投票数

2

2012-10-16

使用此答案中的函数 utf8_truncate() 并逐步解决问题wp_trim_excerpt().

示例代码,未经测试:

 add_filter( 'excerpt_more', 'wpse_69436_excerpt_more' );

function wpse_69436_excerpt_more( $more )
{
    add_filter( 'wp_trim_excerpt', 'wpse_69436_trim_excerpt' );
    // we remove the more text here
    return '';
}

function wpse_69436_trim_excerpt( $excerpt )
{
    return utf8_truncate( $excerpt, 300 );
}

Use the function utf8_truncate() from this answer and fight your way through wp_trim_excerpt().

Sample code, not tested:

add_filter( 'excerpt_more', 'wpse_69436_excerpt_more' );

function wpse_69436_excerpt_more( $more )
{
    add_filter( 'wp_trim_excerpt', 'wpse_69436_trim_excerpt' );
    // we remove the more text here
    return '';
}

function wpse_69436_trim_excerpt( $excerpt )
{
    return utf8_truncate( $excerpt, 300 );
}

原文
fuxia

- 1
- 2012-10-16
WordPress有一个针对该过滤器的过滤器,方便地命名为excerpt_length,它接受许多字符,因此:

function custom_excerpt_length( $length ) { return 50; } add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

将50更改为所需的上限.

每个@toscho评论的更新:

上面的解决方案也适用于单词,而不适用于字符,因此这里是一种快速解决方案:

add_filter('the_excerpt','excerpt_char_limit'); function excerpt_char_limit($e){ return substr($e,0,50); }
WordPress has a filter for that which is conveniently named excerpt_length and it accepts a number of chars so:

function custom_excerpt_length( $length ) { return 50; } add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

change 50 to whatever limit you want.

Update per @toscho comment:

that is the solution above is for words as well and not for chars so here is a quick one:

add_filter('the_excerpt','excerpt_char_limit'); function excerpt_char_limit($e){ return substr($e,0,50); }
- 那不是字符,而是词.
  
  That’s not for characters, it is for words.
  - 1
  - 2012-10-16
  - fuxia
- @toscho我不好！用一个简单的解决方案更新
  
  @toscho My bad! updated with a simple solution
  - 0
  - 2012-10-16
  - Bainternet
- 如何运作?我把它作为"echo custom_excerpt_length();",但是它不起作用.
  
  How does it works? i put it as "echo custom_excerpt_length(); " but it doesn't work.
  - 0
  - 2012-10-16
  - Marcin
- 谢谢,现在可以使用了,但是如何为首页提供一些摘录长度呢?
  
  Thanks, now it works, but how to give some excerpts lengths for front page?
  - 0
  - 2012-10-16
  - Marcin
- @Bainternet-我给了:" add_filter('the_excerpt2','excerpt_char_limit2'); 函数excerpt_char_limit2($e){ 返回substr($e,0,10); }",但不起作用.
  
  @Bainternet - I gave: "add_filter('the_excerpt2','excerpt_char_limit2'); function excerpt_char_limit2($e){ return substr($e,0,10); }" but it doesn't work.
  - 0
  - 2012-10-16
  - Marcin

1

2017-11-06

为更好的方法,可以使用get_the_excerpt过滤器:

 function get_excerpt($excerpt="",$limit=140){

    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = mb_substr($excerpt, 0, $limit);
    $excerpt = mb_substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'...';
    return $excerpt;
}   
add_filter('get_the_excerpt',"get_excerpt");

将$limit=140更改为所需的字符数.另外,如果您想以其他方式:

 add_filter('get_the_excerpt',function ($excerpt="",$limit=140){

    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = mb_substr($excerpt, 0, $limit);
    $excerpt = mb_substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'...';
    return $excerpt;
});

这样可以避免发生任何冲突,例如函数get_excerpt的现有名称.

For a better way, you can use the get_the_excerpt filter:

function get_excerpt($excerpt="",$limit=140){

    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = mb_substr($excerpt, 0, $limit);
    $excerpt = mb_substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'...';
    return $excerpt;
}   
add_filter('get_the_excerpt',"get_excerpt");

Change the $limit=140 to the number of characters you want. Also if you want in different way:

add_filter('get_the_excerpt',function ($excerpt="",$limit=140){

    $excerpt = preg_replace(" (\[.*?\])",'',$excerpt);
    $excerpt = strip_shortcodes($excerpt);
    $excerpt = strip_tags($excerpt);
    $excerpt = mb_substr($excerpt, 0, $limit);
    $excerpt = mb_substr($excerpt, 0, strripos($excerpt, " "));
    $excerpt = trim(preg_replace( '/\s+/', ' ', $excerpt));
    $excerpt = $excerpt.'...';
    return $excerpt;
});

That will make avoid any conflict like existing name of function get_excerpt.

@Nicolai我认为我们应该避免使用mb_substr,因为默认情况下某些php配置不会激活mb功能:/

@Nicolai i think we should avoid using `mb_substr` cause some php config by default doesn't activated mb functions :/
- 0
- 2018-02-26
- med amine hamza
如[here](https://wordpress.stackexchange.com/a/11089/22534)所述,WP具有后备功能.

As read [here](https://wordpress.stackexchange.com/a/11089/22534), WP has a fallback for it.
- 0
- 2018-02-26
- Nicolai

Nicolai · Accepted Answer · 2012-10-16

4

2012-10-16

我在我的最后一个项目中使用了此代码:

 function ng_get_excerpt( $count ){
  $permalink = get_permalink( $post->ID );
  $excerpt = get_the_content();
  $excerpt = strip_tags( $excerpt );
  $excerpt = mb_substr( $excerpt, 0, $count );
  $excerpt = mb_substr( $excerpt, 0, strripos( $excerpt, " " ) );
  $excerpt = rtrim( $excerpt, ",.;:- _!$&#" );
  $excerpt = $excerpt . '<a href="'.$permalink.'" style="text-decoration: none;">&nbsp;(...)</a>';
  return $excerpt;
}

我从这里得到的:

http://wordpress.org/support/topic/limit -excerpt-length-characters

https://stackoverflow.com/questions/10923955/make-function-that-limits-text-not-show-last-punctuation-mark

它的优点是不允许在末尾使用标点符号,并以最后一个完整的单词结尾

使用 @medhamza7 或 @bainternet 或 @fuxia .

I used this code in one of my last projects:

function ng_get_excerpt( $count ){
  $permalink = get_permalink( $post->ID );
  $excerpt = get_the_content();
  $excerpt = strip_tags( $excerpt );
  $excerpt = mb_substr( $excerpt, 0, $count );
  $excerpt = mb_substr( $excerpt, 0, strripos( $excerpt, " " ) );
  $excerpt = rtrim( $excerpt, ",.;:- _!$&#" );
  $excerpt = $excerpt . '<a href="'.$permalink.'" style="text-decoration: none;">&nbsp;(...)</a>';
  return $excerpt;
}

I got it from here:

http://wordpress.org/support/topic/limit-excerpt-length-by-characters

https://stackoverflow.com/questions/10923955/make-function-that-limits-text-not-show-last-punctuation-mark

It has the advantage of not allowing punctuation on the end and ending with the last complete word

Using the filters as suggested by @medhamza7 or @bainternet or @fuxia is preferable.

非常感谢您的建议,对我来说高效的建议很简单:"echo substr(get_the_excerpt(),0,30);"摘自您的链接.

Very thanks for this advice, efficient one for me is just simple: "echo substr(get_the_excerpt(), 0,30);" taken from Your links.
- 0
- 2012-10-16
- Marcin
@Marcin [`substr()`会中断](http://wpengineer.com/2410/dont-use-strlen/).切勿在UTF-8编码的数据上使用它.

@Marcin [`substr()` will break](http://wpengineer.com/2410/dont-use-strlen/). Never use it on UTF-8 encoded data.
- 0
- 2012-10-16
- fuxia