(PHP 4, PHP 5, PHP 7) Get a list of IPv4 addresses corresponding to a given Internet host name array gethostbynamel ( string $hostname ) Returns a list of IPv4 addresses to which the Internet host specified by hostname resolves. Parameters: hostname The host name. Returns: Returns an array of IPv4 addresses or FALSE if hostname could not be res

(PHP 4, PHP 5, PHP 7) Get the IPv4 address corresponding to a given Internet host name string gethostbyname ( string $hostname ) Returns the IPv4 address of the Internet host specified by hostname. Parameters: hostname The host name. Returns: Returns the IPv4 address or a string containing the unmodified hostname on failure.

(PHP 4, PHP 5, PHP 7) Get the Internet host name corresponding to a given IP address string gethostbyaddr ( string $ip_address ) Returns the host name of the Internet host specified by ip_address. Parameters: ip_address The host IP address. Returns: Returns the host name on success, the unmodified ip_address on failure, or FALSE on malformed in

(PHP 4, PHP 5, PHP 7) Open Internet or Unix domain socket connection resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] ) Initiates a socket connection to the resource specified by hostname. PHP supports targets in the Internet and Unix domains as described in List of Supported Socket Transports. A list of supported

(PHP 5, PHP 7) Fetch DNS Resource Records associated with a hostname array dns_get_record ( string $hostname [, int $type = DNS_ANY [, array &$authns [, array &$addtl [, bool &$raw = false ]]]] ) Fetch DNS Resource Records associated with the given hostname. Parameters: hostname hostname should be a valid DNS hostname such as "www.example.com". Reverse looku

(PHP 5, PHP 7) Alias of getmxrr() This function is an alias of: getmxrr().

(PHP 5, PHP 7) Alias of checkdnsrr() This function is an alias of: checkdnsrr().

(PHP 4, PHP 5 < 5.4.0) Initializes all syslog related variables void define_syslog_variables ( void ) Initializes all variables used in the syslog functions. Returns: No value is returned. Syslog variables Variable Constant equal Meaning Notes $LOG_EMERG LOG_EMERG System is unusable $LOG_ALERT LOG_ALERT Immediate action required $LOG_CRIT LOG_CRIT Critical conditions $LOG_ERR LOG_ERR

(PHP 4, PHP 5, PHP 7) Close connection to system logger bool closelog ( void ) closelog() closes the descriptor being used to write to the system logger. The use of closelog() is optional. Returns: Returns TRUE on success or FALSE on failure. See also: syslog() - openlog() -

(PHP 4, PHP 5, PHP 7) Check DNS records corresponding to a given Internet host name or IP address bool checkdnsrr ( string $host [, string $type = "MX" ] ) Searches DNS for records of type type corresponding to host. Parameters: host host may either be the IP address in dotted-quad notation or the host name. type type may be any one of