SNMP::walk

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

SNMP::walk — Fetch SNMP object subtree

Descrição

public 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.

Parâmetros

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.

Valor Retornado

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

Erros/Exceções

Esse método não lança nenhuma exceção por padrão. Para habilitar o lançamento de exceções SNMPException quando ocorrer algum dos erros da biblioteca, o parâmetro exceptions_enabled da classe SNMP deve ser definido com um valor correspondente. Consulte a explicação sobre SNMP::$exceptions_enabled para mais detalhes.

Exemplos

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();
?>

O exemplo acima produzirá algo semelhante a:

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);
?>

O exemplo acima produzirá algo semelhante a:

Array
(
    [1] => igb0
    [2] => igb1
    [3] => ipfw0
    [4] => lo0
    [5] => lagg0
)
Array
(
    [1] => INTEGER: ieee8023adLag(161)
    [2] => INTEGER: ieee8023adLag(161)
    [3] => INTEGER: ethernetCsmacd(6)
    [4] => INTEGER: softwareLoopback(24)
    [5] => INTEGER: ethernetCsmacd(6)
)
Array
(
    [igb0] => INTEGER: ieee8023adLag(161)
    [igb1] => INTEGER: ieee8023adLag(161)
    [ipfw0] => INTEGER: ethernetCsmacd(6)
    [lo0] => INTEGER: softwareLoopback(24)
    [lagg0] => INTEGER: ethernetCsmacd(6)
)

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