SNMP::walk

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

SNMP::walk — Fetch SNMP object subtree

Description

public function SNMP::walk(
    array|string $objectId,
    bool $suffixAsKey = false,
    int $maxRepetitions = -1,
    int $nonRepeaters = -1
): array|false

SNMP::walk() is used to read SNMP subtree rooted at specified objectId.

Parameters

objectId: Root of subtree to be fetched
suffixAsKey: By default full OID notation is used for keys in output array. If set to true subtree prefix will be removed from keys leaving only suffix of object_id.
nonRepeaters: This specifies the number of supplied variables that should not be iterated over. The default is to use this value from SNMP object.
maxRepetitions: This specifies the maximum number of iterations over the repeating variables. The default is to use this value from SNMP object.

Return Values

Returns an associative array of the SNMP object ids and their values on success or false on error. When a SNMP error occurs SNMP::getErrno() and SNMP::getError() can be used for retrieving error number (specific to SNMP extension, see class constants) and error message respectively.

Errors/Exceptions

Throws an SNMPException if a library error occurs and its type is included in the SNMP::$exceptions_enabled bitmask. Otherwise, emits an E_WARNING.

Examples

Example #1 SNMP::walk() example

<?php
  $session = new SNMP(SNMP::VERSION_1, "127.0.0.1", "public");
  $fulltree = $session->walk(".");
  print_r($fulltree);
  $session->close();
?>

The above example will output something similar to:

Array
(
    [SNMPv2-MIB::sysDescr.0] => STRING: Test server
    [SNMPv2-MIB::sysObjectID.0] => OID: NET-SNMP-MIB::netSnmpAgentOIDs.8
    [DISMAN-EVENT-MIB::sysUpTimeInstance] => Timeticks: (1150681750) 133 days, 4:20:17.50
    [SNMPv2-MIB::sysContact.0] => STRING: Nobody
    [SNMPv2-MIB::sysName.0] => STRING: server.localdomain
    ...
)

Example #2 suffixAsKey example

suffixAsKey may be used when merging multiple SNMP subtrees into one. This example maps interface names to their type.

<?php
  $session = new SNMP(SNMP::VERSION_1, "127.0.0.1", "public");
  $session->valueretrieval = SNMP_VALUE_PLAIN;
  $ifDescr = $session->walk(".1.3.6.1.2.1.2.2.1.2", TRUE);
  $session->valueretrieval = SNMP_VALUE_LIBRARY;
  $ifType = $session->walk(".1.3.6.1.2.1.2.2.1.3", TRUE);
  print_r($ifDescr);
  print_r($ifType);
  $result = array();
  foreach($ifDescr as $i => $n) {
    $result[$n] = $ifType[$i];
  }
  print_r($result);
?>