In WordPress – Attachments are their own post-type which means you just need to update the post using wp_update_post(): $media_post = wp_update_post( array( ‘ID’ => $attachment_id, ‘post_parent’ => $post_parent_id, ), true ); if( is_wp_error( $media_post ) ) { error_log( print_r( $media_post, 1 ) ); } In the above you would pass both the Attachment ID … Read more
Using wp_delete_attachment( $attachmentid, true ) is only thing you need. Passing true as second argument, ($force_delete see codex ) it: remove the thumbnail association with any post delete any taxonomy associated to attachment and of course remove all the files, also the autogenerated ones So you do not need to also use delete_post_thumbnail().
You can use taxonomies with the media library, you just need to either add a built-in taxonomy, or register a new one. For example, adding the built-in post tag taxonomy to attachments: function wpd_attachment_taxonomy() { register_taxonomy_for_object_type( ‘post_tag’, ‘attachment’ ); } add_action( ‘init’, ‘wpd_attachment_taxonomy’ ); You can then query for images with a specific tag: $args … Read more
Try this code: function add_featured_image_body_class( $classes ) { global $post; if ( isset ( $post->ID ) && get_the_post_thumbnail($post->ID)) { $classes[] = ‘has-featured-image’; } return $classes; } add_filter( ‘body_class’, ‘add_featured_image_body_class’ );
If you know the URL of the placeholder image, you sure can do it. get_the_post_thumbnail_url() function calls the wp_get_attachment_image_url() function which in turns calls the wp_get_attachment_image_src() function to get the source of the post thumbnail. wp_get_attachment_url() returns the result from wp_get_attachment_image_src filter. So we can use that filter to modify the result if there is … Read more
$data is not verified if it’s array, then workaround patch is as following. media.php:535 foreach ( $imagedata[‘sizes’] as $_size => $data) { if ( is_array($data) ) { // already cropped to width or height; so use this size if ( ( $data[‘width’] == $size[0] && $data[‘height’] <= $size[1] ) || ( $data[‘height’] == $size[1] && … Read more
Customising the size of images served in Visual Composer elements [closed]
If you edited the image (crop or rotate) after inserting it into the post and then changed the image sizes but you don’t update the post that the image appears in to use the new sizes, you can find yourself in this situation. This is intentional behavior. It keeps WordPress from displaying an image in … Read more
I’m running WordPress 3.5.2. The following is an excerpt from my functions.php file, which correctly allows me to select a thumbnail size when I upload an image. // Basic setup for thumbnail support. function themeSetup() { add_theme_support(‘post-thumbnails’); add_image_size(‘tiny’, 128, 79); add_image_size(‘small’, 256, 158); add_image_size(‘medium’, 384, 237); add_image_size(‘large’, 512, 316); } add_action(‘after_setup_theme’, ‘themeSetup’); // Addes custom … Read more
The post featured image ID is stored as post metadata, so I would recommend hooking into the update_post_meta or update_post_metadata hooks, and then query the post meta for ‘_thumbnail_id’ being set. See this related answer from Jan Fabry.