You can check it by adding a hook to save_post action. In this way all your posts will have default value for a custom field. add_action( ‘save_post’, ‘wpse8170_save_post’, 10, 2 ); function wpse8170_save_post( $post_id, WP_Post $post ) { if ( ( defined( ‘DOING_AUTOSAVE’ ) && DOING_AUTOSAVE ) || !current_user_can( ‘edit_post’ ) ) { return; } … Read more
The parent post ID is stored in $post->post_parent. So you can access the parent data by using that ID in get_post_meta(). To get the ancestors use get_post_ancestors( $post->ID ). It returns an array of parent IDs, the last one is the highest. Let’s invent a helper function for the next examples: if ( ! function_exists( … Read more
To add a custom field to attachments, place the following code in your functions.php. add_filter(‘attachment_fields_to_edit’, ‘edit_media_custom_field’, 11, 2 ); add_filter(‘attachment_fields_to_save’, ‘save_media_custom_field’, 11, 2 ); function edit_media_custom_field( $form_fields, $post ) { $form_fields[‘custom_field’] = array( ‘label’ => ‘Custom Field’, ‘input’ => ‘text’, ‘value’ => get_post_meta( $post->ID, ‘_custom_field’, true ) ); return $form_fields; } function save_media_custom_field( $post, $attachment … Read more
The one dirty option is using LIKE comparison in meta query request. It will just treat serialized value as string to make substring match against. It won’t be my first (or second) approach to rely on, but in some cases I had to do it like this. Non-unique meta keys are a little tricky to … Read more
For SQL, the post’s content is saved in “wp_posts” table under “post_content” column. When doing this from phpmyadmin, you’ll have to take care that you’re updating only the main post & not one of it’s revisions If you’re looking for some wordpress based solution, the wordpress way to do it is to use wp_update_post // … Read more
Checking if meta values exist You can use get_posts() (or the WP_Query object) to query all posts which match the post meta you want to save. You will need to specify the post status (i.e. which statuses are you willing to ignore). Below is the untested code to this. (For completeness I’ve left in arguments … Read more
I had a very similar question (“How to make custom bulk actions work on the media/upload page?“) about Justin Stern’s Custom Bulk Action Demo, which was just answered. My biggest piece of advice to you is to take the adaptation one step at a time: make sure you have export working for media before anything … Read more
can you explain why do you need custom fields ? (personally i think they are HUGELY over-used.. especially for images ) if there is no specific reason why you need it , you could use the the_post_thumbnail(); function . like so : the_post_thumbnail(‘thumbnail’); // Thumbnail (default 150px x 150px max) the_post_thumbnail(‘medium’); // Medium resolution (default … Read more
When you specify a meta_key, query_posts() does an INNER JOIN between the wp_posts and wp_postmeta table. That means that any posts that don’t have any meta value for the key you specified won’t ever be returned in that query. In order to do what you need, you should use the same query you posted in … Read more
Updated 06/06/2016: to use term_meta implemented into WordPress 4.4 but I haven’t tested the updated code, if there’s issues leave a comment below. Here’s what I do to add an upload field to my taxonomy terms, in this example I add it to the built in Posts Categories but you could modify it to add … Read more