Description:
------------
When snmprealwalk is asked for complete OID tree (thus it may not be . OID but every OID prefix covers system-wide last OID) it does not handle nosuchname error (that is used in snmpv1 as NOSUCHINSTANCE) reported by agent correctly showing nonsense warnings.

This is because error handling case does not `know' about SNMP_CMD_REALWALK query type, only about SNMP_CMD_WALK.
 

Test script:
---------------
<?php
$machine_ip = "127.0.0.1";
$community = "public";
$oid= ".1.3.6.1";
#$oid= ".1.3.6.1.2.1.1";

snmp_set_oid_output_format(SNMP_OID_OUTPUT_NUMERIC);
$walk_result = snmprealwalk($machine_ip, $community, $oid);

if (empty($walk_result)) {
        print "It's busted\n";
        exit(0);
} else {
        print "Number of entries: " . count($walk_result) . "\n";
}
?>


Expected result:
----------------
Number of entries: <about 4k>

Actual result:
--------------
PHP Warning:  snmprealwalk(): Error in packet: (noSuchName) There is no such variable name in this MIB. in /home/nc/tmp/perl-snmp-test-case/case-1/php-walk-case1.php on line 8
PHP Warning:  snmprealwalk(): This name does not exist: iso.3.6.1.6.3.16.1.5.2.1.6.6.115.121.115.116.101.109.1.1 in /home/nc/tmp/perl-snmp-test-case/case-1/php-walk-case1.php on line 8
It's busted