images

The post object is already available when you are editing a post. if you need it just call global $post; There is also a handy little core function that does this for you, get_attached_media() // Get the images uploaded to the post $images = get_attached_media( ‘image’ );

Just use wp_get_attachment_image_src 2 times, to retrieve the 2 sizes: function display_images_in_list($size=”thumbnail”, $fullsize=”full”) { //.. previous function code is good … foreach($images as $image) { $th = wp_get_attachment_image_src($image->ID, $size); $full = wp_get_attachment_image_src($image->ID, $fullsize ); printf( ‘<a href=”https://wordpress.stackexchange.com/questions/114265/%s”><img src=”https://wordpress.stackexchange.com/questions/114265/%s” width=”%d” height=”%d” alt=”https://wordpress.stackexchange.com/questions/114265/%s” /></a>’, $full[0], $th[0], $th[1], $th[2], esc_attr( $image->post_title ) ); } } } the use … Read more

I think you can only access $file and do something like below. add_filter(‘wp_handle_upload_prefilter’, ‘custom_upload_filter’ ); function custom_upload_filter( $file ){ $file[‘name’] = ‘wordpress-is-awesome-‘ . $file[‘name’]; return $file; } Also have a look how WP does it at wp-includes/file.php