I have a code that call get_the_title() and it works, but get_the_excerpt() return empty. How can i make it work?

This code is inside a plugin called "WP Facebook Open Graph protocol". Here's the part i want to change:

if (is_singular('post')) {
  if (has_excerpt($post->ID)) {
    echo "\t<meta property='og:description' content='".esc_attr(strip_tags(get_the_excerpt($post->ID)))."' />\n";
  }else{
    echo "\t<meta property='og:description' content='". [?] ."' />\n";
  }
}else{
  echo "\t<meta property='og:description' content='".get_bloginfo('description')."' />\n";
}

Here, has_excerpt always fail, and get_the_excerpt($post->ID) don't work anymore (deprecated).

So, how can i display the excerpt there?

ps: I'm using "Advanced Excerpt" plugin as well

  • ok, got it using my_excerpt($post->post_content, get_the_excerpt()) and using the my_excerpt() function from wordpress.stackexchange.com/questions/6961/… – ariel Aug 24 '11 at 0:44
  • 3
    Please add solution you came up with as an answer, so this doesn't haunt site as unanswered question. :) – Rarst Sep 11 '11 at 21:56
  • Just use the_post() (it works on single post template too) function before you call get_the_excerpt() it will setup necessary data for you. – Sisir Sep 18 '14 at 16:01

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));

  • This should be accepted as answer as it's the recommended way to pull data outside the loop. Also doesn't require any custom function or overriding of the $post global variable. – MacK Jun 16 '15 at 16:43
  • 2
    it return empty string. – Kyaw Tun Jan 20 '16 at 7:45
  • 1
    @KyawTun - it works, so long as $post_id is set (what is the value of $post_id? AND $post_id is a valid, legitimate post ID. – cale_b Jan 20 '16 at 15:03
  • 1
    @cale_b Thanks. I use get_posts query and get ID from the resulting array. The post object does have post_title, post_content, ID, etc. But not working. – Kyaw Tun Jan 21 '16 at 12:30
  • If you need JUST the TEXT and not <p> tag which is included with the_excerpt filter, then use "get_the_excerpt" filter, so that above filter becomes: $text = apply_filters('get_the_excerpt', get_post_field('post_excerpt', $post_id)); this will give you just the RAW text you can insert anywhere in your own markup. – Mohsin May 20 '16 at 18:42

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.

  • 1
    This works but: "You must pass a reference to the global $post variable, otherwise functions like the_title() don't work properly." global $post;$post = $post_object;setup_postdata( $post );$excerpt = get_the_excerpt(); – deach Jan 19 '17 at 23:35
  • setup_postdata($post); FTW!!!! – squarecandy Apr 30 '17 at 17:48

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.

  • 1
    Excellent find my friend. I've never understood why WordPress would have deprecated such a critical function. This is effectively rebuilding it from scratch, but it works. Given how often we use the excerpt outside the loop with features like social sharing plugins, it probably should have remained a part of the core. – Imperative Ideas May 15 '14 at 2:56
  • 1
    EAMann's answer is a much better approach to this problem, and the should be considered the best practice. This approach is basically duplicating Core's internals instead of using the API. – Ian Dunn Mar 24 '15 at 1:18

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

  • 1
    This should be new accepted answer since we are in WP 4.5 + era. – Matija Mrkaic Jun 13 '16 at 12:18
  • 11
    This won't work if the excerpt is empty as the wp_trim_excerpt filter will return the excerpt for the current post. – Dylan Aug 16 '16 at 22:24
  • 7
    See core.trac.wordpress.org/ticket/36934 for details on what @Dylan said – kraftner Sep 14 '16 at 7:18
up vote 5 down vote accepted

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

  • 2
    Link-only answers are no good. Copy the relevant code here. When that link is broken, that site is down / gone, then this answer has no value. – cale_b Jun 18 '14 at 15:23
  • It worked perfectly for me! – Saikat Jul 24 '17 at 12:19

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;
}
  • But the asker has a post object as stated in the question. – fuxia Nov 25 '12 at 19:51
  • 2
    Correct me if I'm wrong, this method will return the manual excerpt but won't generate one if needed – Bill Nov 7 '14 at 12:46

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;
}
  • This is the most direct way to do it.. Not sure it's great performance-wise though. You still get my +1 – Bill Nov 7 '14 at 12:47

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;
  • Please edit your answer, and add an explanation: why could that solve the problem? – fuxia Mar 14 at 20:25

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