php - How to get post image caption by index

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I have multiple images in WordPress post, each image has different caption. I want to get the image caption by the image index, but I can't figure out how to print the caption.

Here is what I have tried:

//$index - index of the image (if index is 0, its first image)
function getImageCaption($postID, $index){
    $post_id = $postID;
    // get the post object
    $post = get_post( $post_id );
    // get the post thumbnail ID
    $thumbnail_id = get_post_thumbnail_id($post->ID);
    // we need just the content
    $thumbnail_image = get_posts(array('p' => $thumbnail_id, 'post_type' => 'attachment'));

    if ($thumbnail_image && isset($thumbnail_image[$index])) {
        return $thumbnail_image[$index]->post_excerpt;
    } else {
        return;
    }
}

How can I display image caption by index?

I have multiple images in WordPress post, each image has different caption. I want to get the image caption by the image index, but I can't figure out how to print the caption.

Here is what I have tried:

//$index - index of the image (if index is 0, its first image)
function getImageCaption($postID, $index){
    $post_id = $postID;
    // get the post object
    $post = get_post( $post_id );
    // get the post thumbnail ID
    $thumbnail_id = get_post_thumbnail_id($post->ID);
    // we need just the content
    $thumbnail_image = get_posts(array('p' => $thumbnail_id, 'post_type' => 'attachment'));

    if ($thumbnail_image && isset($thumbnail_image[$index])) {
        return $thumbnail_image[$index]->post_excerpt;
    } else {
        return;
    }
}

How can I display image caption by index?

• php
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Share Improve this question asked Nov 19, 2020 at 13:44 YotamYotam 111 bronze badge 5

• If you know the post ID you can use get_post instead of get_posts and avoid needing to use an index – Tom J Nowell ♦ Commented Nov 19, 2020 at 14:04
• @TomJNowell I'm having multiple images in one post, so I need to index the image.. But I guess my syntax is wrong here and I can't figure out why.. – Yotam Commented Nov 19, 2020 at 14:08
• Your get_posts call retrieves a single post, aka the post thumbnail, it's not retrieving the images in the post, and the caption is stored in the post content not on the attachment. To do what you want to do you need to parse the current posts content, not call get_posts – Tom J Nowell ♦ Commented Nov 19, 2020 at 14:30
• @TomJNowell Thanks, that helped me solve it. – Yotam Commented Nov 19, 2020 at 15:08
• can you post your solution as an answer for others with this question? – Tom J Nowell ♦ Commented Nov 19, 2020 at 15:22

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1 Answer 1

Sorted by: Reset to default 0

I have used function to extract data inside figcaption tags, and $position is stand for the index of the current image.

  function getImageCaption($postID, $position){
        $post_id = $postID;
        // get the post object
        $post = get_post( $post_id );
        // we need just the content
        $content = $post->post_content;
        // we need a expression to match things
        $regex = '/<figcaption>(.*)<\/figcaption>/';
        // we want all matches
        preg_match_all( $regex, $content, $matches );
        // reversing the matches array
        $matches = array_reverse($matches);
        // we've reversed the array, so index 0 returns the result
        foreach ($matches as $key => $value) {
            return $value[$position];
        }
    }

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