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In the filter, you will need to find the post parent of $post, get the value of the custom field of parent post and then add that value to $post['post_excerpt'] (where the caption is stored): add_filter('attachment_fields_to_save', 'wpse_insert_custom_caption', 10, 2); function insert_custom_default_caption($post, $attachment) { //Check if the $post is ...


WordPress stores image (attachment) data as follows: Description: post_content field Caption: post_excerpt field Alt: _wp_attachment_image_alt meta value And in code, that translates to: // Description echo $post->post_content; // Raw the_content(); // Caption (description as fallback) the_excerpt(); // Caption (explicitly) echo ...

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