Changing the Name Attribute of a Hidden Field

/**

 * Custom function to change the name attribute of hidden fields in any form.

 *

 * @link   https://wpforms.com/developers/how-to-change-the-name-attribute-of-a-hidden-field/

 */

function wpf_field_properties_hidden( $properties, $field, $form_data ) {

    // Optional, you can limit to specific forms. Below, we restrict output to only the form #1000.

    if ( absint( $form_data[ 'id' ] ) !== 1000 ) {

        return;

    }

    // Look for the name attribute and set the name attribute to custom_name_hidden_field

    $properties[ 'inputs' ][ 'primary' ][ 'attr' ][ 'name' ] = 'custom_name_hidden_field';

    return $properties;

}

add_filter( 'wpforms_field_properties_hidden', 'wpf_field_properties_hidden', 10, 3 );