snmpget是取具体的OID的值。（适用于OID值是一个叶子节点的情况）

snmpwalk

snmpwalk — Fetch all the objects from an agent

 <?php
$a = snmpwalk("127.0.0.1", "public", ""); 
foreach ($a as $val) {
    echo "$val\n";
}
?>

snmprealwalk

snmprealwalk — 返回一个该oid对应的子oid和其值组成的关联数组,,其返回的是关联数组,也是其和snmpwalk主要的区别

 <?php
 print_r(snmprealwalk("localhost", "public", "IF-MIB::ifName"));
?>

 Array

      (

      [IF-MIB::ifName.1] => STRING: lo

      [IF-MIB::ifName.2] => STRING: eth0

      [IF-MIB::ifName.3] => STRING: eth2

      [IF-MIB::ifName.4] => STRING: sit0

      [IF-MIB::ifName.5] => STRING: sixxs

    )

ifName

snmp 简单网管协议

snmpwalk

snmprealwalk