checkdnsrr
(PHP 3, PHP 4 )
checkdnsrr -- Check DNS records corresponding to a given Internet host name or IP addressDescription
int checkdnsrr ( string host [, string type])Searches DNS for records of type type corresponding to host. Returns TRUE if any records are found; returns FALSE if no records were found or if an error occurred.
type may be any one of: A, MX, NS, SOA, PTR, CNAME, AAAA, or ANY. The default is MX.
Host may either be the IP address in dotted-quad notation or the host name.
Note: AAAA type added with PHP 5.0.0
See also getmxrr(), gethostbyaddr(), gethostbyname(), gethostbynamel(), and the named(8) manual page.