(PHP 4, PHP 5)
checkdnsrr — Check DNS records corresponding to a given Internet host name or IP address
$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.
  
| Version | Description | 
|---|---|
| 5.3.0 | This function is now available on Windows platforms. | 
| 5.2.4 | TXT typewas added. | 
Note:
For compatibility with Windows before this was implemented, then try the » PEAR class » Net_DNS.