(PHP3 , PHP4 )
checkdnsrr -- Check DNS records corresponding to a given Internet host name or IP addressint 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, or ANY. The default is MX.
Host may either be the IP address in dotted-quad notation or the host name.
See also getmxrr(), gethostbyaddr(), gethostbyname(), gethostbynamel(), and the named(8) manual page.