checkdnsrr

Function • Params and return types changed in PHP 8.0

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

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

checkdnsrr Function synopsis

checkdnsrr(string $hostname, string $type = "MX"): bool

Parameters

$hostname

Typestring

$hostname may either be the IP address in dotted-quad notation or the host name.

$type

OptionalTypestringDefault value"MX"

$type may be any one of: A, MX, NS, SOA, PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY.

$type accepts one of the following string values:

  • A
  • MX
  • NS
  • SOA
  • PTR
  • CNAME
  • AAAA
  • A6
  • SRV
  • NAPTR
  • TXT
  • ANY

Return value

Typebool

Returns true if any records are found; returns false if no records were found or if an error occurred.

Changes to the checkdnsrr Function

PHP 8.0

  • Return type added: bool
  • Parameter name of parameter #1 changed: $host to $hostname
  • Parameter type added for parameter #1 ($hostname): string
  • Parameter type added for parameter #2 ($type): string
  • Parameter default value added for position #2 ($type): "MX"
- checkdnsrr($host, $type)
+ checkdnsrr(string $hostname, string $type = "MX"): bool

checkdnsrr Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Security-Fixes Only Yes
PHP 8.2Security-Fixes Only Yes
PHP 8.1Unsupported Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes