snmpwalk -- Fetch all the SNMP objects from an agent


array snmpwalk(string hostname, string community, string object_id, int [timeout] , int [retries] );

Returns an array of SNMP object values starting from the object_id() as root and false on error.

snmpwalk() function is used to read all the values from an SNMP agent specified by the hostname. Community specifies the read community for that agent. A null object_id is taken as the root of the SNMP objects tree and all objects under that tree are returned as an array. If object_id is specified, all the SNMP objects below that object_id are returned.

$a = snmpwalk("", "public", ""); 

Above function call would return all the SNMP objects from the SNMP agent running on localhost. One can step through the values with a loop

for ($i=0; $i<count($a); $i++) {
    echo $a[$i];