If anyone else would like to update the title & alt text from a dashed/underscored file name for an Image field with multiple images, this worked for me (in a class) pulled together from a few different examples:
add_action( 'rwmb_my_image_field_name_after_save_field', array( $this, 'image_title_alt' ), 10, 5 );
public function image_title_alt( $null, $field, $new, $old, $object_id ) {
$images = rwmb_meta( 'my_image_field_name', array(), $object_id );
foreach ( $images as $image ) {
$title = $image['title'];
$title = str_replace( array( '-', '_' ), ' ', $title );
$title = ucwords( strtolower( $title ) );
update_post_meta( $image['ID'], '_wp_attachment_image_alt', $title );
wp_update_post(
array(
'ID' => $image['ID'],
'post_title' => $title,
)
);
}
}
Cheers.
