在循环

使用my_excerpt($post-＆gt;post_content,get_the_excerpt())并使用使用wp_trim_excerpt在循环外获取the_excerpt()

got it using my_excerpt($post->post_content, get_the_excerpt()) and using the my_excerpt() function from Using wp_trim_excerpt to get the_excerpt() outside the loop

我在寻找如何在没有发布对象的情况下执行此操作时发现了这个问题.

我的其他研究发现了这种巧妙的技术:

$text = apply_filters('the_excerpt', get_post_field('post_excerpt', $post_id));

I found this question when looking how to do this without the post object.

My additional research turned up this slick technique:

$text = apply_filters('the_excerpt', get_post_field('post_excerpt', $post_id));

由于似乎您已经有需要摘录的post对象,因此您可以强制工作:

 setup_postdata( $post );
$excerpt = get_the_excerpt();
 

setup_postdata()函数将全球化$post对象,并使其可用于常规的旧循环函数.在循环中时,您调用the_post()并为您进行设置...在循环外,您需要手动强制执行.

Since it seems you already have the post object you need the excerpt for, you can just force things to work:

setup_postdata( $post );
$excerpt = get_the_excerpt();

The setup_postdata() function will globalize the $post object and make it available for regular old loop function. When you're inside the loop, you call the_post() and it sets things up for you ... outside of the loop you need to force it manually.

尝试一下:

在functions.php中创建一个新函数,然后从任何地方调用它.

 function get_excerpt_by_id($post_id){
    $the_post = get_post($post_id); //Gets post ID
    $the_excerpt = $the_post->post_content; //Gets post_content to be used as a basis for the excerpt
    $excerpt_length = 35; //Sets excerpt length by word count
    $the_excerpt = strip_tags(strip_shortcodes($the_excerpt)); //Strips tags and images
    $words = explode(' ', $the_excerpt, $excerpt_length + 1);

    if(count($words) > $excerpt_length) :
        array_pop($words);
        array_push($words, '…');
        $the_excerpt = implode(' ', $words);
    endif;

    $the_excerpt = '<p>' . $the_excerpt . '</p>';

    return $the_excerpt;
}
 

这是一个描述代码的帖子.

Try this:

Create a new function in functions.php and then call it from wherever.

function get_excerpt_by_id($post_id){
    $the_post = get_post($post_id); //Gets post ID
    $the_excerpt = $the_post->post_content; //Gets post_content to be used as a basis for the excerpt
    $excerpt_length = 35; //Sets excerpt length by word count
    $the_excerpt = strip_tags(strip_shortcodes($the_excerpt)); //Strips tags and images
    $words = explode(' ', $the_excerpt, $excerpt_length + 1);

    if(count($words) > $excerpt_length) :
        array_pop($words);
        array_push($words, '…');
        $the_excerpt = implode(' ', $words);
    endif;

    $the_excerpt = '<p>' . $the_excerpt . '</p>';

    return $the_excerpt;
}

Here's a post describing the code.

现在,您只需使用 get_the_excerpt( $postID ) 函数. 从以下版本开始:WordPress 4.5.0引入了$post参数.

Now you can simply use the get_the_excerpt( $postID ) function. Since: WordPress 4.5.0 introduced the $post parameter.

如果没有post对象,这是一个简短的功能,如Withers的功能.

 function get_excerpt_by_id($post_id){
    $the_post = get_post($post_id);
    $the_excerpt = $the_post->post_excerpt; 
    return $the_excerpt;
}
 

In case you don't have the post object, here's a short function like the one from Withers.

function get_excerpt_by_id($post_id){
    $the_post = get_post($post_id);
    $the_excerpt = $the_post->post_excerpt; 
    return $the_excerpt;
}

这是当您想在循环外使用get_the_excerpt()时使用的:

 function custom_get_excerpt($post_id) {
    $temp = $post;
    $post = get_post($post_id);
    setup_postdata($post);

    $excerpt = get_the_excerpt();

    wp_reset_postdata();
    $post = $temp;

    return $excerpt;
}
 

This is for when you want to use get_the_excerpt() outside the loop:

function custom_get_excerpt($post_id) {
    $temp = $post;
    $post = get_post($post_id);
    setup_postdata($post);

    $excerpt = get_the_excerpt();

    wp_reset_postdata();
    $post = $temp;

    return $excerpt;
}

如果您想自动从一行内容中摘录-您可以使用 wp_trim_words 函数如下:

 // 30 is the number of words ehere
$excerpt = wp_trim_words(get_post_field('post_content', $post_id), 30);
 

If you'd like to generate the excerpt automatically from the content in one line - you can use wp_trim_words function like this:

// 30 is the number of words ehere
$excerpt = wp_trim_words(get_post_field('post_content', $post_id), 30);

 $trimexcerpt = get_the_content();
$shortexcerpt = wp_trim_words( $trimexcerpt, $num_words = 18, $more = '… ' ); 
echo $shortexcerpt;
 

$trimexcerpt = get_the_content();
$shortexcerpt = wp_trim_words( $trimexcerpt, $num_words = 18, $more = '… ' ); 
echo $shortexcerpt;