Custom_Image_Header::insert_attachment( array $attachment, string $cropped ): int

1353	final public function insert_attachment( $attachment, $cropped ) {1354		$parent_id = $attachment['post_parent'] ?? null;1355		unset( $attachment['post_parent'] );1356 1357		$attachment_id = wp_insert_attachment( $attachment, $cropped );1358		$metadata      = wp_generate_attachment_metadata( $attachment_id, $cropped );1359 1360		// If this is a crop, save the original attachment ID as metadata.1361		if ( $parent_id ) {1362			$metadata['attachment_parent'] = $parent_id;1363		}1364 1365		/**1366		 * Filters the header image attachment metadata.1367		 *1368		 * @since 3.9.01369		 *1370		 * @see wp_generate_attachment_metadata()1371		 *1372		 * @param array $metadata Attachment metadata.1373		 */1374		$metadata = apply_filters( 'wp_header_image_attachment_metadata', $metadata );1375 1376		wp_update_attachment_metadata( $attachment_id, $metadata );1377 1378		return $attachment_id;1379	}