# Network Functions

## Table of Contents

- checkdnsrr — Check DNS records corresponding to a given Internet host name or IP address
- closelog — Close connection to system logger
- define_syslog_variables — Initializes all syslog related variables
- dns_check_record — Alias of checkdnsrr
- dns_get_mx — Alias of getmxrr
- dns_get_record — Fetch DNS Resource Records associated with a hostname
- fsockopen — Open Internet or Unix domain socket connection
- gethostbyaddr — Get the Internet host name corresponding to a given IP address
- gethostbyname — Get the IPv4 address corresponding to a given Internet host name
- gethostbynamel — Get a list of IPv4 addresses corresponding to a given Internet host name
- gethostname — Gets the host name
- getmxrr — Get MX records corresponding to a given Internet host name
- getprotobyname — Get protocol number associated with protocol name
- getprotobynumber — Get protocol name associated with protocol number
- getservbyname — Get port number associated with an Internet service and protocol
- getservbyport — Get Internet service which corresponds to port and protocol
- header_register_callback — Call a header function
- header_remove — Remove previously set headers
- header — Send a raw HTTP header
- headers_list — Returns a list of response headers sent (or ready to send)
- headers_sent — Checks if or where headers have been sent
- http_response_code — Get or Set the HTTP response code
- inet_ntop — Converts a packed internet address to a human readable representation
- inet_pton — Converts a human readable IP address to its packed in_addr representation
- ip2long — Converts a string containing an (IPv4) Internet Protocol dotted address into a long integer
- long2ip — Converts an long integer address into a string in (IPv4) Internet standard dotted format
- openlog — Open connection to system logger
- pfsockopen — Open persistent Internet or Unix domain socket connection
- setcookie — Send a cookie
- setrawcookie — Send a cookie without urlencoding the cookie value
- socket_get_status — Alias of stream_get_meta_data
- socket_set_blocking — Alias of stream_set_blocking
- socket_set_timeout — Alias of stream_set_timeout
- syslog — Generate a system log message