apply_filters( 'attachment_fields_to_save', array $post, array $attachment )

804			 *805			 * @see wp_get_attachment_metadata()806			 *807			 * @param array $post       An array of post data.808			 * @param array $attachment An array of attachment metadata.809			 */810			$post = apply_filters( 'attachment_fields_to_save', $post, $attachment );811 812			if ( isset( $attachment['image_alt'] ) ) {813				$image_alt = wp_unslash( $attachment['image_alt'] );814 815				if ( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) !== $image_alt ) {816					$image_alt = wp_strip_all_tags( $image_alt, true );