Geocoding a postcode using WordPress post meta.

Google Geocode

$prev_location  = get_post_meta($post->ID, '_cottages_custom_postal_code', true );
$lat            = get_post_meta($post->ID, '_cottages_custom_location_latitude', true );
$lng            = get_post_meta($post->ID, '_cottages_custom_location_longitude', true );

if (
    (
        $cottages_meta['_cottages_custom_postal_code'] != '' && 
        $prev_location != $cottages_meta['_cottages_custom_postal_code'] 
    ) || 
    $lat == '' || 
    $lng == ''
){

    $url = "https://maps.googleapis.com/maps/api/geocode/json?address=" . urlencode($cottages_meta['_cottages_custom_postal_code']) . "&key=XXX&sensor=false";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $data = curl_exec($ch);
    curl_close($ch);
    $data = json_decode($data);

    if( $data ){

        if( is_array( $data->results )){

            $lat_lng = $data->results[0]->geometry->location;
            $cottages_meta['_cottages_custom_location_latitude'] = $lat_lng->lat;
            $cottages_meta['_cottages_custom_location_longitude'] = $lat_lng->lng;

        }

    }

}