如何防止 Wordpress 在摘录中剥离 HTML 标签

I am using wp_trim_words to trim some excerpts on my homepage. It's working fine except that it's stripping the HTML tags from the excerpts. I need to be able to make certain pieces of the excerpt bold (using <strong>). Following the instructions here, I tried removing the wp_trim_words function and replacing it with a new one using the following code, which replaces $text = wp_strip_all_tags( $text ); from the original WP function with $text = strip_tags($text, '<strong>',);. But this breaks the site. What am I doing wrong?

    // Remove Reverie Trim Words
function remove_trim_words() {
    remove_filter('get_the_excerpt', 'wp_trim_words');
    add_filter('get_the_excerpt', 'oakwood_trim_words');
}

// Replace Reverie Trim Words
function oakwood_trim_words( $text, $num_words = 55, $more = null ) {
    if ( null === $more )
        $more = __( '…' );
    $original_text = $text;
    $text = strip_tags($text, '<strong>',);
    /* translators: If your word count is based on single characters (East Asian characters),
       enter 'characters'. Otherwise, enter 'words'. Do not translate into your own language. */
    if ( 'characters' == _x( 'words', 'word count: words or characters?' ) && preg_match( '/^utf-?8$/i', get_option( 'blog_charset' ) ) ) {
        $text = trim( preg_replace( "/[

	 ]+/", ' ', $text ), ' ' );
        preg_match_all( '/./u', $text, $words_array );
        $words_array = array_slice( $words_array[0], 0, $num_words + 1 );
        $sep = '';
    } else {
        $words_array = preg_split( "/[

	 ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
        $sep = ' ';
    }
    if ( count( $words_array ) > $num_words ) {
        array_pop( $words_array );
        $text = implode( $sep, $words_array );
        $text = $text . $more;
    } else {
        $text = implode( $sep, $words_array );
    }
    /**
     * Filter the text content after words have been trimmed.
     *
     * @since 3.3.0
     *
     * @param string $text          The trimmed text.
     * @param int    $num_words     The number of words to trim the text to. Default 5.
     * @param string $more          An optional string to append to the end of the trimmed text, e.g. &hellip;.
     * @param string $original_text The text before it was trimmed.
     */
    return apply_filters( 'oakwood_trim_words', $text, $num_words, $more, $original_text );
}

推荐答案

完整指南摘录

我最近回答了几个关于摘录的问题，所以我会尽可能详细地解释一下.

I've recently answered a few questions regarding excerpts, so I' going to give a detailed explanation covering as much as I can.

HTML 标签/格式

the_excerpt() 首先不排除任何参数，所以没有什么可以传递给它.事实上，the_excerpt() 将内容修剪为 55 个单词，并且在返回文本之前去除所有 html 标签.the_excerpt() 位于 wp-includes/post-template.php.要允许摘录中的某些或所有 html 标记，必须创建新的摘录.

the_excerpt() first of all doesn't except any parameters, so nothing can be passed to it. In is a fact that the_excerpt() trims the content to 55 words, and all html tags are stripped before returning the text. the_excerpt() is located in wp-includes/post-template.php. To allow certain or all html tags in the excerpt, a new excerpt have to be created.

首先需要先把原来的函数去掉，然后新的函数需要hook到get_the_excerpt.请注意，这个新的摘录在模板文件中仍可作为 the_excerpt() 调用，无需更改.get_the_excerpt() 位于 wp-includes/post-template.php.

First of all, the original function needs to be removed first, and then the new function needs to be hooked to get_the_excerpt. Please take note, this new excerpt will still be callable as the_excerpt() in template files, no need to change that. get_the_excerpt() is located in wp-includes/post-template.php.

摘录使用wp_trim_excerpt返回修剪后的文本，所以我们需要删除wp_trim_excerpt 首先来自摘录过滤器.wp_trim_excerpt() 位于 wp-includes/formatting.php，第 2355 行.这是如何:

The excerpt uses wp_trim_excerpt to return the trimmed text, so we need to remove wp_trim_excerpt first from the excerpt filter. wp_trim_excerpt() is located in wp-includes/formatting.php, line 2355. This is how:

remove_filter('get_the_excerpt', 'wp_trim_excerpt');

您现在可以将新摘录添加到 get_the_excerpt

You can now add your new excerpt to get_the_excerpt

add_filter('get_the_excerpt', 'wpse_custom_wp_trim_excerpt');

要允许 html 标签/格式，我们需要指定您需要允许的标签.您可以使用以下 strip_tags 语句来实现

To allow html tags/formatting, we will need to specify which tags you will need to allow. You can use the following strip_tags statement to achieve that

$wpse_excerpt = strip_tags($wpse_excerpt, wpse_allowedtags());

第二个参数 wpse_allowedtags() 是一个小函数，用于添加 the_excerpt() 允许的标签.如需有效 HTML5 标签的完整列表，请前往此处查看.这是函数，向其中添加您需要允许/保留的任何 html 标记

The second argument wpse_allowedtags() is a small function that is used to add the tags the_excerpt() will allow. For a complete list of valid HTML5 tags, go and check it out here. Here is function, add any html tag to this that you need to allow/keep

function wpse_allowedtags() {
// Add custom tags to this string
    return '<script>,<style>,<br>,<em>,<i>,<ul>,<ol>,<li>,<a>,<p>,<img>,<video>,<audio>'; 
}

如果需要允许所有HTML标签，即不剥离任何标签，可以完全省略/删除strips_tags()函数.

If you need to allow all HTML tags, that is, no stripping of any tags, the strips_tags() function can be omitted/removed completely.

但是需要注意的一点是，当允许使用 html 标签时，这些标签被计为字数，因此带标签和不带标签的摘录的字数不会相同.要纠正这一点，您需要先从实际字数中删除这些标签，以便只计算字数.

A point to note however, when html tags are allowed, these tags are counted as words, so your word count for excerpts with tags and without tags will not be the same. To correct that, you will need to remove these tags from the actual word count first so that only words are counted.

我写了一个摘录，允许所有标签，仅将单词计为单词，并在设定的单词数量后完成一个句子(不会在句子中间修剪文本)并在最后一个单词后添加阅读更多文本.

I have written an excerpt that will allow all tags, count only words as words, and complete a sentence after the set amount of words (won't trim text mid-sentence) and add a read more text after the last word.

这是完整的代码

function wpse_allowedtags() {
    // Add custom tags to this string
        return '<script>,<style>,<br>,<em>,<i>,<ul>,<ol>,<li>,<a>,<p>,<img>,<video>,<audio>'; 
    }

if ( ! function_exists( 'wpse_custom_wp_trim_excerpt' ) ) : 

    function wpse_custom_wp_trim_excerpt($wpse_excerpt) {
    global $post;
    $raw_excerpt = $wpse_excerpt;
        if ( '' == $wpse_excerpt ) {

            $wpse_excerpt = get_the_content('');
            $wpse_excerpt = strip_shortcodes( $wpse_excerpt );
            $wpse_excerpt = apply_filters('the_content', $wpse_excerpt);
            $wpse_excerpt = str_replace(']]>', ']]&gt;', $wpse_excerpt);
            $wpse_excerpt = strip_tags($wpse_excerpt, wpse_allowedtags()); /*IF you need to allow just certain tags. Delete if all tags are allowed */

            //Set the excerpt word count and only break after sentence is complete.
                $excerpt_word_count = 75;
                $excerpt_length = apply_filters('excerpt_length', $excerpt_word_count); 
                $tokens = array();
                $excerptOutput = '';
                $count = 0;

                // Divide the string into tokens; HTML tags, or words, followed by any whitespace
                preg_match_all('/(<[^>]+>|[^<>s]+)s*/u', $wpse_excerpt, $tokens);

                foreach ($tokens[0] as $token) { 

                    if ($count >= $excerpt_word_count && preg_match('/[,;?.!]s*$/uS', $token)) { 
                    // Limit reached, continue until , ; ? . or ! occur at the end
                        $excerptOutput .= trim($token);
                        break;
                    }

                    // Add words to complete sentence
                    $count++;

                    // Append what's left of the token
                    $excerptOutput .= $token;
                }

            $wpse_excerpt = trim(force_balance_tags($excerptOutput));

                $excerpt_end = ' <a href="'. esc_url( get_permalink() ) . '">' . '&nbsp;&raquo;&nbsp;' . sprintf(__( 'Read more about: %s &nbsp;&raquo;', 'wpse' ), get_the_title()) . '</a>'; 
                $excerpt_more = apply_filters('excerpt_more', ' ' . $excerpt_end); 

                //$pos = strrpos($wpse_excerpt, '</');
                //if ($pos !== false)
                // Inside last HTML tag
                //$wpse_excerpt = substr_replace($wpse_excerpt, $excerpt_end, $pos, 0); /* Add read more next to last word */
                //else
                // After the content
                $wpse_excerpt .= $excerpt_end; /*Add read more in new paragraph */

            return $wpse_excerpt;   

        }
        return apply_filters('wpse_custom_wp_trim_excerpt', $wpse_excerpt, $raw_excerpt);
    }

endif; 

remove_filter('get_the_excerpt', 'wp_trim_excerpt');
add_filter('get_the_excerpt', 'wpse_custom_wp_trim_excerpt'); 

您可以从需要额外的函数中删除//".

You can just remove the '//' from functions that you need extra.

自定义摘录长度

有时您需要显示不同长度的简单摘录，并且为每个帖子/功能/页面编写摘录是不可行的.这是一个使用 wp_trim_words

Sometimes you need to display simple excerpts of different lengths and it is not viable to write an excerpt for every post/function/page. Here is a nice small little function using wp_trim_words

function wpse_custom_excerpts($limit) {
    return wp_trim_words(get_the_excerpt(), $limit, '<a href="'. esc_url( get_permalink() ) . '">' . '&nbsp;&hellip;' . __( 'Read more &nbsp;&raquo;', 'wpse' ) . '</a>');
}

这个小函数的作用是将 get_the_excerpt 修剪为用户设置的 $limit 并在末尾返回带有阅读更多链接的文本.

What this little function do is taking get_the_excerpt trimming that to $limit set by the user and returning the text with a read more link at the end.

您可以在模板中按如下方式调用此摘录

You can call this excerpt as follow in your template

echo wpse_custom_excerpts($limit);

其中 $limit 将是您的字数，因此 30 个字的摘录将是

where $limit will be your word count, so an excerpt of 30 word will be

echo wpse_custom_excerpts(30);

这里要记住一件事，如果您将限制设置为超过 55 个单词，则只会返回 55 个单词，因为摘录的长度仅为 55 个单词.如果需要更长的摘录，请改用 get_the_content.

Just one thing to remember here, if you set your limit to more that 55 words, only 55 words will be returned as the excerpt is only 55 words in length. If longer excerpts are needed, use get_the_content instead.

自定义摘录长度

如果只需要修改the_excerpt()的长度，可以使用下面的函数

If you just need to alter the length of the_excerpt(), you can use the following function

function wpse_excerpt_length( $length ) {
    return 20;
}
add_filter( 'excerpt_length', 'wpse_excerpt_length', 999 );

请记住，您需要设置大于 10 的优先级，以便您的自定义函数在默认值之后执行.

Remember, you will need to set a priority bigger than 10 so that your custom function executes after the default.

添加阅读更多链接

摘录返回的所有文本都在末尾带有不可点击的讨厌的 [...].要在 helips 的位置添加阅读更多文本，请使用此功能

All text returned by the excerpt have the hated [...] at the end that is not clickable. To add a read more text in the place of the hellips, use this function

 function wpse_excerpt_more( $more ) {
    return ' <a class="read-more" href="'. get_permalink( get_the_ID() ) . '">' . __('Read More', 'your-text-domain') . '</a>';
}
add_filter( 'excerpt_more', 'wpse_excerpt_more' );

编辑

摘录第一段

我想保持完整，所以这里是第一段之后的摘录

I want to keep this complete, so here is the excerpt that trims after the first paragraph

这是一个保持 HTML 标签完整的功能，在摘录的末尾添加一个阅读更多"链接，并在第一段之后修剪摘录.

Here is a function that keeps HTML tags in tact, adds a "Read More" link at the end of the excerpt and trims the excerpt after the first paragraph.

if ( ! function_exists( 'wpse0001_custom_wp_trim_excerpt' ) ) : 

function wpse0001_custom_wp_trim_excerpt($wpse0001_excerpt) {
global $post;
$raw_excerpt = $wpse0001_excerpt;
if ( '' == $wpse0001_excerpt ) {

$wpse0001_excerpt = get_the_content('');
$wpse0001_excerpt = strip_shortcodes( $wpse0001_excerpt );
$wpse0001_excerpt = apply_filters('the_content', $wpse0001_excerpt);
$wpse0001_excerpt = substr( $wpse0001_excerpt, 0, strpos( $wpse0001_excerpt, '</p>' ) + 4 );
$wpse0001_excerpt = str_replace(']]>', ']]&gt;', $wpse0001_excerpt);

$excerpt_end = ' <a href="'. esc_url( get_permalink() ) . '">' . '&nbsp;&raquo;&nbsp;' . sprintf(__( 'Read more about: %s &nbsp;&raquo;', 'pietergoosen' ), get_the_title()) . '</a>'; 
$excerpt_more = apply_filters('excerpt_more', ' ' . $excerpt_end); 

//$pos = strrpos($wpse0001_excerpt, '</');
//if ($pos !== false)
// Inside last HTML tag
//$wpse0001_excerpt = substr_replace($wpse0001_excerpt, $excerpt_end, $pos, 0);
//else
// After the content
$wpse0001_excerpt .= $excerpt_end;

return $wpse0001_excerpt;

}
return apply_filters('wpse0001_custom_wp_trim_excerpt', $wpse0001_excerpt, $raw_excerpt);
}

endif; 

remove_filter('get_the_excerpt', 'wp_trim_excerpt');
add_filter('get_the_excerpt', 'wpse0001_custom_wp_trim_excerpt');

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