rwmb_{$field_type}_value

This filter is used to change a field value before saving it in the database.

apply_filters( "rwmb_{$field['type']}_value", $new, $field, $old, $object_id );

It accepts 4 parameters:

Name	Description
$new	Field value which will be saved in the database
$field	Field settings
$old	The old meta value of the field (which was previously in the database)
$object_id	The object ID

This filter has variations:

• rwmb_{$field_type}_value: apply for fields with a specific type
• rwmb_{$field_id}_value: apply for a field with a specific id

Examples

Disallowing a value from being saved:

add_filter( 'rwmb_event_date_value', function( $new, $field, $old, $object_id ) {
    if ( $new === '2022-05-01' ) { // No events on Labor Day
        $new = '';
    }
    return $new;
} );