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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

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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
2  
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 at 16:01

6 Answers 6

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.

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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.

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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 at 2:56
up vote 2 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

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1  
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 at 15:23

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));

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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;
}
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But the asker has a post object as stated in the question. –  toscho Nov 25 '12 at 19:51

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;
}
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