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Accessing ACF author field in a function

  • I have a custom field ‘zipcode’ and this is setup as a custom Author field. I’m using Relevanssi to do a standard search with the Authors as opposed to blog posts or pages. On the results page, I’m able to, in the loop, retrieve the custom zipcode field as such:

    $zipCode = get_field('nestwell_user_b_zipcode', 'user_'.$userID );

    and then I’m free to use the $zipCode variable to pull in each users zip code. However… I have a function in functions.php that needs to access this zipcode. For the life of me i can’t seem to figure it out. I need to construct a custom URL with the users zipcode from ACF in this function. Right now the $to variable is hard coded to a zipcode and it all works great. Though I need it to be dynamic for each user in the loop.

    How can I achieve this??

    function google_distance_between_places( $from, $to ,$decimals = 0 ){
      $url = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
      parse_str(parse_url($url)['query'], $zipURL);
      $from   = $zipURL['zip'];
      $to     = '99141';
      $data   = file_get_contents("$from&destinations=$to&key=xxx&language=en-EN&sensor=false");
      $data   = json_decode($data);
      $distance   = 0;
      if( !empty( $data->rows[0]->elements ) ){
          foreach($data->rows[0]->elements as $road) {
              if( $road->status == 'OK' ){
                  if( isset( $road->distance->value ) ){
                      $distance += $road->distance->value;
                  $convert_miles = 1609.344;
                  $distance = ( $distance / $convert_miles );
                  $distance = round( $distance,$decimals );
                  $distance = "not_found";
      return $distance;
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