(PHP >= 5.2.0)
snmp2_real_walk — Return all objects including their respective object ID within the specified one
$host
   , string $community
   , string $object_id
   [, string $timeout = 1000000
   [, string $retries = 5
  ]] )
   The snmp2_real_walk() function is used to traverse over a number
   of SNMP objects starting from object_id
   and return not only their values but also their object ids.
  
host
    The hostname of the SNMP agent (server).
community
    The read community.
object_id
    The SNMP object id which precedes the wanted one.
timeout
    The number of microseconds until the first timeout.
retries
    The number of times to retry if timeouts occur.
   Returns an associative array of the SNMP object ids and their values on success or FALSE on error.
   In case of an error, an E_WARNING message is shown.
  
Example #1 Using snmp2_real_walk()
<?php
 print_r(snmp2_real_walk("localhost", "public", "IF-MIB::ifName"));
?>
The above will output something like:
    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
    )