EU Referendum Rules triggering a 2nd EU Referendum

<?php
$d = json_decode(file_get_contents('https://petition.parliament.uk/petitions/131215.json'),true);
printf('Last update: %s'.PHP_EOL,$d['data']['attributes']['updated_at']);
foreach(['signatures_by_country','signatures_by_constituency'] as $type){
    $n = 0;
    foreach($d['data']['attributes'][$type] as $k => $v){
        $n += $v['signature_count'];
    }
    printf('%s: %d'.PHP_EOL,$type,$n);
}
unset($type,$n,$d,$k,$v);