wp_get_attachment_metadata() WordPress Function

function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;

	if ( ! $attachment_id ) {
		$post = get_post();

		if ( ! $post ) {
			return false;
		}

		$attachment_id = $post->ID;
	}

	$data = get_post_meta( $attachment_id, '_wp_attachment_metadata', true );

	if ( ! $data ) {
		return false;
	}

	if ( $unfiltered ) {
		return $data;
	}

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data          Array of meta data for the given attachment.
	 * @param int   $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $attachment_id );
}
Uses	Description
wp-includes/plugin.php:apply_filters()	Calls the callback functions that have been added to a filter hook.
wp-includes/post.php:wp_get_attachment_metadata	Filters the attachment meta data.
wp-includes/post.php:get_post_meta()	Retrieves a post meta field for the given post ID.
wp-includes/post.php:get_post()	Retrieves post data given a post ID or post object.
Used By	Description
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php:WP_REST_Attachments_Controller::edit_media_item()	Applies edits to a media item and creates a new attachment record.
wp-includes/media.php:wp_img_tag_add_width_and_height_attr()	Adds `width` and `height` attributes to an `img` HTML tag.
wp-includes/media.php:wp_img_tag_add_srcset_and_sizes_attr()	Adds `srcset` and `sizes` attributes to an existing `img` HTML tag.
wp-includes/post.php:wp_get_original_image_path()	Retrieves the path to an uploaded image file.
wp-includes/post.php:wp_get_original_image_url()	Retrieve the URL to an original attachment image.
wp-admin/includes/image.php:wp_get_missing_image_subsizes()	Compare the existing image sub-sizes (as saved in the attachment meta) to the currently registered image sub-sizes, and return the difference.
wp-admin/includes/image.php:wp_update_image_subsizes()	If any of the currently registered image sub-sizes are missing, create them and update the image meta data.
wp-includes/widgets/class-wp-widget-media-image.php:WP_Widget_Media_Image::render_media()	Render the media on the frontend.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::import_theme_starter_content()	Imports theme starter content into the customized state.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php:WP_REST_Attachments_Controller::prepare_item_for_response()	Prepares a single attachment output for response.
wp-includes/media.php:wp_get_attachment_image_srcset()	Retrieves the value for an image attachment’s ‘srcset’ attribute.
wp-includes/media.php:wp_get_attachment_image_sizes()	Retrieves the value for an image attachment’s ‘sizes’ attribute.
wp-includes/media.php:wp_calculate_image_sizes()	Creates a ‘sizes’ attribute value for an image.
wp-admin/includes/image-edit.php:wp_restore_image()	Restores the metadata for a given attachment.
wp-admin/includes/image-edit.php:wp_save_image()	Saves image to post, along with enqueued changes in `$_REQUEST['history']`.
wp-admin/includes/image-edit.php:wp_image_editor()	Loads the WP image-editing interface.
wp-admin/includes/media.php:edit_form_image_editor()	Displays the image and editor in the post editor
wp-admin/includes/media.php:attachment_submitbox_metadata()	Displays non-editable attachment metadata in the publish meta box.
wp-admin/includes/media.php:get_media_item()	Retrieves HTML form for modifying the image attachment.
wp-admin/includes/post.php:edit_post()	Updates an existing post with values provided in `$_POST`.
wp-admin/includes/ajax-actions.php:wp_ajax_save_attachment()	Ajax handler for updating attachment attributes.
wp-admin/includes/meta-boxes.php:attachment_id3_data_meta_box()	Displays fields for ID3 data.
wp-admin/includes/class-custom-image-header.php:Custom_Image_Header::step_2()	Display second step of custom header image page.
wp-includes/theme.php:get_uploaded_header_images()	Gets the header images uploaded for the active theme.
wp-includes/post-template.php:prepend_attachment()	Wraps attachment in paragraph tag before content.
wp-includes/media.php:wp_maybe_generate_attachment_metadata()	Maybe attempts to generate attachment metadata, if missing.
wp-includes/media.php:wp_prepare_attachment_for_js()	Prepares an attachment post object for JS, where it is expected to be JSON-encoded and fit into an Attachment model.
wp-includes/media.php:gallery_shortcode()	Builds the Gallery shortcode output.
wp-includes/media.php:wp_playlist_shortcode()	Builds the Playlist shortcode output.
wp-includes/media.php:image_get_intermediate_size()	Retrieves the image’s intermediate size (resized) path, width, and height.
wp-includes/media.php:wp_get_attachment_image()	Get an HTML img element representing an image attachment.
wp-includes/media.php:image_downsize()	Scale an image to fit a particular size (such as ‘thumb’ or ‘medium’).
wp-includes/post.php:wp_delete_attachment()	Trash or delete an attachment.
wp-includes/post.php:wp_get_attachment_thumb_file()	Retrieve thumbnail for an attachment.
wp-includes/class-wp-xmlrpc-server.php:wp_xmlrpc_server::_prepare_media_item()	Prepares media item data for return in an XML-RPC object.