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LXVI. Network Functions

Introduction

Requirements

No external libraries are needed to build this extension.

Installation

There is no installation needed to use these functions; they are part of the PHP core.

Runtime Configuration

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

Table 1. Network Configuration Options

Name Default Changeable
define_syslog_variables "0" PHP_INI_ALL
For further details and definition of the PHP_INI_* constants see ini_set().

Here is a short explanation of the configuration directives.

define_syslog_variables boolean

Whether or not to define the various syslog variables (e.g. $LOG_PID, $LOG_CRON, etc.). Turning it off is a good idea performance-wise. At runtime, you can define these variables by calling define_syslog_variables().

Resource Types

This extension has no resource types defined.

Predefined Constants

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

Table 2. openlog() Options

Constant Description
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

Table 3. openlog() Facilities

Constant Description
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

Table 4. syslog() Priorities (in descending order)

Constant Description
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

Table 5. dns_get_record() Options

Constant Description
DNS_A IPv4 Address Resource
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 RFC 1010 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 Itteratively query the name server for each available record type.
Table of Contents
checkdnsrr --  Check DNS records corresponding to a given Internet host name or IP address
closelog -- Close connection to system logger
debugger_off -- Disable internal PHP debugger (PHP 3)
debugger_on -- Enable internal PHP debugger (PHP 3)
define_syslog_variables -- Initializes all syslog related constants
dns_check_record -- Synonym for checkdnsrr()
dns_get_mx -- Synonym for 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 IP address corresponding to a given Internet host name
gethostbynamel --  Get a list of IP addresses corresponding to a given Internet 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
ip2long --  Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address.
long2ip --  Converts an (IPv4) Internet network address into a string in Internet standard dotted format
openlog -- Open connection to system logger
pfsockopen --  Open persistent Internet or Unix domain socket connection
socket_get_status --  Alias of stream_get_meta_data().
socket_set_blocking -- Alias for stream_set_blocking()
socket_set_timeout -- Alias for stream_set_timeout()
syslog -- Generate a system log message