StackOverflow2013

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copied!<pre><code>/* your base data */ $domains = array(/* your data */); /* a list of domains per ip number, like $domain_by_ip['64.34.119.12'] = 'stackoverflow.com' */ $domain_by_ip = array(); /* a list counting number of domains by ip number */ $ip_count = array(); /* a list of domains we faild to fetch ip number for */ $failed = array(); /* loop through all doains */ foreach($domains as $current_domain) { /* fetch the A record for all domains */ $current_dns_record = dns_get_record($current_domain, DNS_A); /* if there is a dns record */ if($current_dns_record) { /* fetch ip from result */ $current_ip = $current_dns_record[0]['ip']; /* thos row is not needed, but php may triggering a warning oterhwise */ if(!isset($domain_by_ip[$current_ip])) $domain_by_ip[$current_ip] = array(); if(!isset$ip_count[$current_ip])) $ip_count[$current_ip] = array(); /* add domain to the list by ip */ $domain_by_ip[$current_ip][] = $current_dns_record; /* count up the count of domains on this ip */ $ip_count[$current_ip]++; } else { /* if there was no dns record, put this domain on the fail list */ $failed[] = $current_domain; } } /* create a list for storing batches */ $batches = array(); /* as long as we have ip-numbers left to use */ while($ip_count) { /* create a list for storing current batch */ $current_batch = array(); /* sort ip-numbers so we take the ip-numbers whit most domains first */ arsort($ip_count); /* take the top 5 ip-numbers from the list */ $current_batch_ip_list = array_slice(array_keys($ip_count), 0, 5); /* foreach of thous 5 ip-numbers .. */ foreach($current_batch_ip_list as $current_ip) { /* move one domain from the domain by ip list to the current batch */ $current_batch[] = array_pop($domain_by_ip[$current_ip]); /* count down the numbers of domains left for that ip */ $ip_count[$current_ip]--; /* if there is no more domains on this ip, remove it from the list */ if($ip_count[$current_ip] == 0) { unset($ip_count[$current_ip]); } } /* add current batch to the list of batches */ $batches[] = $current_batch; } </code></pre>

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