Check DNS records corresponding to a given Internet host name or IP address

bool checkdnsrr ( string $host [, string $type = "MX" ] )

Searches DNS for records of type type corresponding to host.

host: host may either be the IP address in dotted-quad notation or the host name.
type: type may be any one of: A, MX, NS, SOA, PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY.

Returns TRUE if any records are found; returns FALSE if no records were found or if an error occurred.

版本	说明
5.3.0	This function is now available on Windows platforms.
5.2.4	TXT `type` was added.
5.0.0	AAAA `type` was added.

Note:
For compatibility with Windows before this was implemented, then try the » PEAR class » Net_DNS.

dns_get_record() - Fetch DNS Resource Records associated with a hostname
getmxrr() - Get MX records corresponding to a given Internet host name
gethostbyaddr() - Get the Internet host name corresponding to a given IP address
gethostbyname() - Get the IPv4 address corresponding to a given Internet host name
gethostbynamel() - Get a list of IPv4 addresses corresponding to a given Internet host name
the named(8) manual page