(PHP 5 >= 5.4.0, PHP 7, PHP 8)
SNMP::__construct — Creates SNMP instance representing session to remote SNMP agent
$version,$hostname,$community,$timeout = -1,$retries = -1Creates SNMP instance representing session to remote SNMP agent.
version
SNMP protocol version:
SNMP::VERSION_1,
SNMP::VERSION_2C,
SNMP::VERSION_3.
hostname
The SNMP agent. hostname may be suffixed with
optional SNMP agent port after colon. IPv6 addresses must be enclosed in square
brackets if used with port. If FQDN is used for hostname
it will be resolved by PHP SNMP extension, not by
Net-SNMP engine. Usage
of IPv6 addresses when specifying FQDN may be forced by enclosing FQDN
into square brackets. Here are some examples:
| IPv4 with default port | 127.0.0.1 |
| IPv6 with default port | ::1 or [::1] |
| IPv4 with specific port | 127.0.0.1:1161 |
| IPv6 with specific port | [::1]:1161 |
| FQDN with default port | host.domain |
| FQDN with specific port | host.domain:1161 |
| FQDN with default port, force usage of IPv6 address | [host.domain] |
| FQDN with specific port, force usage of IPv6 address | [host.domain]:1161 |
community
Specifies the security level for given version.
The purpose of community access string is
SNMP version specific:
SNMP::VERSION_1
|
public for read-only permission or
private for read-write
|
SNMP::VERSION_2C
|
public for read-only permission or
private for read-write
|
SNMP::VERSION_3
|
SNMPv3 security name, may be one of:
noAuthNoPriv,
authNoPriv (an auth passphrase and auth protocol are required), or
authPriv (both an auth passphrase and a protocol, as well as
a privacy passphrase and protocol are required)
|
timeoutThe number of microseconds until the first timeout.
retriesThe number of retries in case timeout occurs.
SNMP::__construct() throws an exception when parameters count or types are wrong or unknown SNMP protocol version specified.
示例 #1 Fetching the physical location of the host
<?php
$session = new SNMP(SNMP::VERSION_1, "127.0.0.1", "public");
$sysdescr = $session->get("sysDescr.0");
echo "$sysdescr\n";
?>以上示例的输出类似于：
STRING: Test server