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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_PERROR | print log message also to standard error
LOG_PID | include PID with each message

Table 3. 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

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