PHP Network

The Network extension provides various network functions.

Requirements

Functions checkdnsrr(), getmxrr() and dns_get_record() requires Bind on Linux.

Installation

There is no installation needed to use these functions;

They are part of the PHP core.

Run-time Configuration

The behavior of these functions is affected by settings in php.ini.

Network Configuration Options

Resource Types

This extension defines a file pointer resource returned by fsockopen() and pfsockopen().

Predefined Constants

The constants below are always available as part of the PHP core.

• openlog() Options
  • LOG_CONS
    • if there is an error while sending data to the system logger, write directly to the system console
  • LOG_NDELAY
    • open the connection to the logger immediately
  • LOG_ODELAY
    • (default) delay opening the connection until the first message is logged
  • LOG_NOWAIT
  • LOG_PERROR
    • print log message also to standard error
  • LOG_PID
    • include PID with each message
• openlog() Facilities
  • LOG_AUTH
    • security/authorization messages (use LOG_AUTHPRIV instead in systems where that constant is defined)
  • LOG_AUTHPRIV
    • security/authorization messages (private)
  • LOG_CRON
    • clock daemon (cron and at)
  • LOG_DAEMON
    • other system daemons
  • LOG_KERN
    • kernel messages
  • LOG_LOCAL0 ... LOG_LOCAL7
    • reserved for local use, these are not available in Windows
  • LOG_LPR
    • line printer subsystem
  • LOG_MAIL
    • mail subsystem
  • LOG_NEWS USENET
    • news subsystem
  • LOG_SYSLOG
    • messages generated internally by syslogd
  • LOG_USER
    • generic user-level messages
  • LOG_UUCP UUCP
    • subsystem
• syslog() Priorities (in descending order)
  • LOG_EMERG
    • system is unusable
  • LOG_ALERT
    • action must be taken immediately
  • LOG_CRIT
    • critical conditions
  • LOG_ERR
    • error conditions
  • LOG_WARNING
    • warning conditions
  • LOG_NOTICE
    • normal, but significant, condition
  • LOG_INFO
    • informational message
  • LOG_DEBUG
    • debug-level message
• dns_get_record() Options
  • DNS_A IPv4
    • Address Resource
  • DNS_CAA
    • Certification Authority Authorization Resource (available as of PHP 7.0.16 and 7.1.2)
  • DNS_MX
    • Mail Exchanger Resource
  • DNS_CNAME
    • Alias (Canonical Name) Resource
  • DNS_NS
    • Authoritative Name Server Resource
  • DNS_PTR
    • Pointer Resource
  • DNS_HINFO
    • Host Info Resource (See IANA's » Operating System Names for the meaning of these values)
  • DNS_SOA
    • Start of Authority Resource
  • DNS_TXT
    • Text Resource
  • DNS_ANY
    • Any Resource Record. On most systems this returns all resource records,
    • however, it should not be counted upon for critical uses. Try DNS_ALL instead.
  • DNS_AAAA IPv6
    • Address Resource
  • DNS_ALL
    • Iteratively query the name server for each available record type.

Network Functions

• checkdnsrr — Check DNS records corresponding to a given Internet hostname 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 hostname

• gethostbynamel — Get a list of IPv4 addresses corresponding to a given Internet hostname

• gethostname — Gets the hostname

• getmxrr — Get MX records corresponding to a given Internet hostname

• 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 a 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