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Digg  gethostbynamel
Get a list of IP addresses corresponding to a given Internet host
name
(PHP 4, PHP 5)
Example 1597. gethostbynamel() example<?phpThe above example will output: ArrayCode Examples / Notes » gethostbynamelinfo
The solution is simpel. Just add a . (point) to the end of the URL for correct name resolving. Without this point PHP thinks it's a subdomain of your local domain and so returns the "local-IP". skyld
Obviously, in some cases, not all IPs are likely to be useful while checking a hostname. Sometimes also, not all IPs will work. This code will check for the first WORKING IP from the list. Or at least it should - I haven't had time to test it yet. Needs domain parameter, and port and max IPs to check are optional. If port is not set, it will check HTTP port 80, and if max IPs to check is not set, it will only check the first 10 IPs from the list. Hope it helps someone. <?php function checkhostlist($domain, $port = 80, $maxipstocheck = 10) { $hosts = gethostbynamel($domain); for ($chk=0;$chk<$maxipstocheck;$chk++) { if (isset($hosts[$chk])) { $th = fsockopen($domain, $port); if ($th) { fclose($th); return $hosts[$chk]; break; } } } } ?> webdev
In PHP 5.0.4, gethostbynamel returns an empty string instead of false if the lookup fails. A simple workaround for this error is to use is_array() in an IF block: <? $hosts = gethostbynamel($hostname); if (is_array($hosts)) { echo "Host ".$hostname." resolves to: "; foreach ($hosts as $ip) { echo "IP: ".$ip." "; } } else { echo "Host ".$hostname." is not tied to any IP."; } ?> |
Change Language
checkdnsrr closelog debugger_off debugger_on define_syslog_variables dns_check_record dns_get_mx dns_get_record fsockopen gethostbyaddr gethostbyname gethostbynamel getmxrr getprotobyname getprotobynumber getservbyname getservbyport header headers_list headers_sent inet_ntop inet_pton ip2long long2ip openlog pfsockopen setcookie setrawcookie socket_get_status socket_set_blocking socket_set_timeout syslog |
