<?php

$id = "ID";
$password = "PASSWORD";

$url = "http://top.mail.ru/json/srchlanding?id=$id&action=json&password=$password&pp=50000&rettype=all";

$data = json_decode(file_get_contents($url));

$domains = [];
$se = [];

foreach($data->elements as $hit):
    $domains[$hit->sign][parse_url($hit->url, PHP_URL_HOST)] += $hit->hits;
    $se[$hit->sign] += $hit->hits;
endforeach;

foreach($se as $name => $value):
    echo "<h2>$name = $value</h2>";
    echo "<table>";
    foreach($domains[$name] as $domain => $hits):
        echo "<tr><td><i>$domain</i></td><td><b>$hits</b></td></tr>";
    endforeach;
    echo "</table>";
endforeach;