Update image attributes when alt text is updated.

iap-update-attributes-when-alt-text-changes

/**
 * Update image attributes when alt text is updated.
 * 
 * Runs when image alt text is updated using update_post_meta and 
 * calls iaffpro_auto_image_attributes_pro() function to update image attributes.
 * 
 * Settings from "Bulk Updater Settings" tab are used to update the attributes.
 * 
 * @param int $meta_id ID of metadata entry to update.
 * @param int $object_id Image ID.
 * @param string $meta_key Metadata key. Will be '_wp_attachment_image_alt' for image alt text.
 * @param mixed  $meta_value Metadata value. 
 * 
 * @link https://developer.wordpress.org/reference/functions/update_metadata/
 */
function prefix_iap_update_attributes_when_alt_text_changes( $meta_id, $object_id, $meta_key, $meta_value ) {
	
	// Proceed only when image alt text is being updated.
	if ( $meta_key !== '_wp_attachment_image_alt' ) {
		return;
	}

	// Return if Image Attributes Pro is disabled.
	if ( ! function_exists( 'iaffpro_auto_image_attributes_pro' ) ) {
		return;
	}

	// Get the object of the image form image ID.
	$image_object = get_post( $object_id );

	// Run the pro module and update image attributes.
	iaffpro_auto_image_attributes_pro( $image_object, true );
}
add_action( 'updated_postmeta','prefix_iap_update_attributes_when_alt_text_changes', 10, 4 );