Gravity Forms - Dynamic Checkboxes

functions.php

<?php
/*-----------------------------------------------------------------------------------*/
/* Putting Locations in Checkboxes */
/* Helpful article - https://www.gravityhelp.com/documentation/article/dynamically-populating-drop-down-fields/  */
/*-----------------------------------------------------------------------------------*/
$location_form_id = 9;
add_filter( 'gform_pre_render_'.$location_form_id, 'populate_posts' );
add_filter( 'gform_pre_validation_'.$location_form_id, 'populate_posts' );
add_filter( 'gform_pre_submission_'.$location_form_id, 'populate_posts' );
add_filter( 'gform_pre_submission_filter_'.$location_form_id, 'populate_posts' );
add_filter( 'gform_admin_pre_render_'.$location_form_id, 'populate_posts' );

function populate_posts( $form ) {
  foreach ( $form['fields'] as &$field ) {
    if ( $field->label == 'Location') {
      $fieldid = $field->id;
      $terms = get_terms('post_tag',array('hide_empty'=>0));
      /* Other qualifiers on https://developer.wordpress.org/reference/functions/get_terms/ */
      $choices = array(); 
      $inputs = array();
      $idincrease = 1;
      foreach ( $terms as $post ) {
        if ( $idincrease % 10 == 0 ) {
          $idincrease++;
        }
        $choices[] = array( 'text' => $post->name, 'value' => $post->name);
        $inputs[] = array( 'label' => $post->name, 'id' => "{$fieldid}.{$idincrease}" );
        $idincrease++; 
      }
      $field->choices = $choices;
      $field->inputs = $inputs;
    }
  }
  return $form;
}
?>

The {$fieldid} isnt declare and get an error. Can you tell me, how to populate with the newest version? after i make a choice, the checkboxes are empty....

I set $fieldid in line 16. This pulls from the tags listed in WP. It was basically just helpful for me to understand how to get the checkboxes populated at all.

Sorry...dont see this. Works :)