You have a number of options. You could use the add_filter( ‘the_content’, ‘add_data_attributes’ ); And after that find the images attached to the post. Or you can use the image_send_to_editor filter more here.
The featured image is stored as post meta with the key _thumbnail_id, so you could use a meta query to get posts with a specific thumbnail: $posts = new WP_Query( array( ‘meta_query’ => array( array( ‘key’ => ‘_thumbnail_id’, ‘value’ => $attachment_id, ), ), ) ); Where $attachment_id is the ID of the image.
I sometimes get this exact same issue and set of symptoms. It’s caused by the image being too large for the memory available. Not the file size as that has compressed data, but the actual width x height x colourdepth. You can see the full size image because it uploaded fine. You have trouble in … Read more
The “All Posts” page – /wp-admin/edit.php – does not show a featured image just by using WP Core. You have to add code to display featured images there. You may need to look back at your backups to see what code you were previously using to get the featured image to show up. It could … Read more
The equivalent function for arbitrary images that aren’t the post thumbnail is wp_get_attachment_image(). It works similarly, but you need to pass the attachment ID, and there’s an $icon argument that doesn’t really do much: echo wp_get_attachment_image( $attachment_id, ‘large’, false, [] );
The function the_post_thumbnail() grabs the featured image for you. You can specify the full size image like this, I think: the_post_thumbnail(‘full’)
$image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), “full” ); echo ‘<a href=”‘ . $image[0] . ‘”>Link to Full Size</a>’;
Generally speaking, there’s no need to do this. However, if it’s one added using add_image_size, it will be in the $_wp_additional_image_sizes global. global $_wp_additional_image_sizes; echo $_wp_additional_image_sizes[‘small’][‘width’];
You should use the built-in WordPress media manager to attach/insert images in posts. That way, if you define $content_width appropriately, WordPress will auto-resize large sized images to fit accordingly. Otherwise, you’ll have to rely on using CSS to set the max-width property for images within your content container (e.g. #content img{ max-width: 500px; height: auto; … Read more
I’m glad that better support should be added in version 3.4 but for now I’ve fixed the issue by changing the behaviour of image insertion so that it doesn’t use the shortcode. Here’s what I added to functions.php: add_filter( ‘disable_captions’, create_function(‘$a’, ‘return true;’) ); function image_send_to_editor_2($html, $id, $caption, $title, $align, $url, $size, $alt) { if … Read more