September 2001
Intermediate to advanced
768 pages
32h 45m
English
Content preview from PHP Functions Essential Reference
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checkdnsrr
bool checkdnsrr(string host, [string type])
| host | Hostname or IP address to check |
| type | Type of record for which to check |
Checks for DNS resource records for the given host.
Returns:
TRUE if a record can be found; FALSE on error
Description:
Performs a DNS lookup on the specified host (either a hostname or IP address) and returns TRUE if a record of the specified type is found. This function can look up the following record types:
| Record Type | Details |
|---|---|
| A | Address: Defined in RFC 1035. |
| ALL | Any of the valid types. |
| CNAME | Canonical Name: Defined in RFC 1035. |
| MX | Mail Exchanger: Defined in RFC 1035. |
| NS | Name Server: Defined in RFC 1035. |
| PTR | Pointer: Defined in RFC 1035. |
| SOA | Start of Authority: Defined in RFC 1035. |
If no record type is specified, ...
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