Any pointers would be greatly appreciated.

EDIT: In the Browserconsole under "requests" i see Status Server error 500 but dont understand why..

Any pointers would be greatly appreciated.

/* GDM 2019 */ function getDrivingDistance($startstreet, $startcity, $endstreet, $endcity) { $url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".urlencode($startstreet)."+".urlencode($startcity)."&destinations=".urlencode($endstreet)."+".urlencode($endcity)."&mode=driving&key=AIzaSyDtNDZRDEy2b8FLchNY4I2Okl1sLlFEIDw";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response_a = json_decode($response, true);

$dist = $response_a['rows'][0]['elements'][0]['distance']['text'];
$meters = $response_a['rows'][0]['elements'][0]['distance']['value'];
$time = $response_a['rows'][0]['elements'][0]['duration']['text'];


return array('distance' => $dist, 'meters'=> $meters, 'time' => $time);

}

function gdmDist($street, $city){ $result = getDrivingDistance('Industrieweg 16', 'Vught', $street, $city);

return ($result['meters']);

}

add_filter( 'gform_pre_render_6', 'populate_html' );

function populate_html( $form ) {
//this is a 2-page form with the data from page one being displayed in an html field on page 2
$current_page = GFFormDisplay::get_current_page( $form['id'] );
     
if ( $current_page == 2 ) {
    foreach ( $form['fields'] as &$field ) {
        //gather form data to save into html field (id 6 on my form), exclude page break
        $field_data = rgpost('input_' . $field->id );
        if ( $field->id == 49 && $field->type != 'page' ) 
            {                                        
                $html_content_49 .= $field_data;                                        
            }            
        elseif ( $field->id == 50 ) 
        {         
                $html_content_50 .= $field_data;                               
        }            
    }                                   
    //loop back through form fields to get html field (id 6 on my form) that we are populating with the data gathered above
    foreach( $form['fields'] as &$field ) {
        //get html field
        if ( $field->id == 51 ) {
            //set the field content to the html
            $field->content = $html_content_49;
        }              
        elseif ( $field->id == 58 ) {
            //set the field content to the html
            $field->content = $html_content_50;
        } 
        elseif ( $field->id == 60 ) {
            $fieldval_address =  $html_content_49;
            $fieldval_city = $html_content_50;
            $result_end = getDrivingDistance('Industrieweg 16', 'Vught', $fieldval_address, $fieldval_city);                    
            //$result = gdmDist($fieldval_address, $fieldval_city);                    
            //set the field content to the html                
            $field->content = $result_end;                
        } 
        else {}
    }                                        
}
//return altered form so changes are displayed
return $form;

}

/* GDM 2019 */
function getDrivingDistance($startstreet, $startcity, $endstreet, $endcity)
{
    $url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".urlencode($startstreet)."+".urlencode($startcity)."&destinations=".urlencode($endstreet)."+".urlencode($endcity)."&mode=driving&key=AIzaSyDtNDZRDEy2b8FLchNY4I2Okl1sLlFEIDw";
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    $response = curl_exec($ch);
    curl_close($ch);
    $response_a = json_decode($response, true);
    
    $dist = $response_a['rows'][0]['elements'][0]['distance']['text'];
    $meters = $response_a['rows'][0]['elements'][0]['distance']['value'];
    $time = $response_a['rows'][0]['elements'][0]['duration']['text'];
    

    return array('distance' => $dist, 'meters'=> $meters, 'time' => $time);
}


function gdmDist($street, $city){
    $result = getDrivingDistance('Lindenstraat 12', 'Schijndel', $street, $city);
    
    return ($result['meters']);
}


add_filter( 'gform_pre_render_6', 'populate_html' ); 

    function populate_html( $form ) {
    //this is a 2-page form with the data from page one being displayed in an html field on page 2
    $current_page = GFFormDisplay::get_current_page( $form['id'] );
         
    if ( $current_page == 2 ) {
        foreach ( $form['fields'] as &$field ) {
            //gather form data to save into html field (id 6 on my form), exclude page break
            $field_data = rgpost('input_' . $field->id );
            if ( $field->id == 49 && $field->type != 'page' ) 
                {                                        
                    $html_content_49 .= $field_data;                                        
                }            
            elseif ( $field->id == 50 ) 
            {         
                    $html_content_50 .= $field_data;                               
            }            
        }                                   
        //loop back through form fields to get html field (id 6 on my form) that we are populating with the data gathered above
        foreach( $form['fields'] as &$field ) {
            //get html field
            if ( $field->id == 51 ) {
                //set the field content to the html
                $field->content = $html_content_49;
            }              
            elseif ( $field->id == 58 ) {
                //set the field content to the html
                $field->content = $html_content_50;
            } 
            elseif ( $field->id == 60 ) {
                $fieldval_address =  $html_content_49;
                $fieldval_city = $html_content_50;
                $result_end = getDrivingDistance('Industrieweg 16', 'Vught', $fieldval_address, $fieldval_city);                    
                //$result = gdmDist($fieldval_address, $fieldval_city);                    
                //set the field content to the html                
                $field->content = $result_end;                
            } 
            else {}
        }                                        
    }
    //return altered form so changes are displayed
    return $form;
}