<?php
function getCoordinates($address) {

    $address = urlencode($address);

    // set HTTP header
    $headers = array('Content-Type: application/json');

    // Open connection
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, 'http://maps.google.com/maps/api/geocode/json?sensor=false&address=' . $address);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);

    // Execute request
    $result = curl_exec($curl);

    // Close connection
    curl_close($curl);

    // get the result and parse to JSON

    $json = json_decode($result);

    $lat = $json->results[0]->geometry->location->lat;
    $lng = $json->results[0]->geometry->location->lng;

    return array($lat, $lng);

}

$coords = getCoordinates("ADDRESS GOES HERE ");
$coords = join(',', $coords);

?>

<?php the_title(); ?>, <?php if( get_field('address_line_1') ): ?><?php the_field('address_line_1', $post_id); ?><?php endif; ?>,<?php if( get_field('address_line_2') ): ?><?php the_field('address_line_2', $post_id); ?><?php endif; ?>, <?php if( get_field('town') ): ?><?php the_field('town', $post_id); ?><?php endif; ?>, <?php if( get_field('post_code') ): ?><?php the_field('post_code', $post_id); ?><?php endif; ?>, <?php if( get_field('country') ): ?><?php the_field('country', $post_id); ?><?php endif; ?>