private function changeSNMPSettings()
 {
     if (function_exists("snmp_get_quick_print")) {
         $this->snmpSavedQuickPrint = snmp_get_quick_print();
         snmp_set_quick_print(1);
     }
     if (function_exists("snmp_get_valueretrieval")) {
         $this->snmpSavedValueRetrieval = snmp_get_valueretrieval();
     }
     if (function_exists('snmp_set_oid_output_format')) {
         snmp_set_oid_output_format(SNMP_OID_OUTPUT_NUMERIC);
     }
     if (function_exists('snmp_set_valueretrieval')) {
         snmp_set_valueretrieval(SNMP_VALUE_PLAIN);
     }
 }
 function ReadData($targetstring, &$map, &$item)
 {
     $data[IN] = NULL;
     $data[OUT] = NULL;
     $data_time = 0;
     $timeout = 1000000;
     $retries = 2;
     $abort_count = 0;
     $in_result = NULL;
     $out_result = NULL;
     if ($map->get_hint("snmp_timeout") != '') {
         $timeout = intval($map->get_hint("snmp_timeout"));
         debug("Timeout changed to " . $timeout . " microseconds.\n");
     }
     if ($map->get_hint("snmp_abort_count") != '') {
         $abort_count = intval($map->get_hint("snmp_abort_count"));
         debug("Will abort after {$abort_count} failures for a given host.\n");
     }
     if ($map->get_hint("snmp_retries") != '') {
         $retries = intval($map->get_hint("snmp_retries"));
         debug("Number of retries changed to " . $retries . ".\n");
     }
     if (preg_match("/^snmp:([^:]+):([^:]+):([^:]+):([^:]+)\$/", $targetstring, $matches)) {
         $community = $matches[1];
         $host = $matches[2];
         $in_oid = $matches[3];
         $out_oid = $matches[4];
         if ($abort_count == 0 || $abort_count > 0 && (!isset($this->down_cache[$host]) || intval($this->down_cache[$host]) < $abort_count)) {
             if (function_exists("snmp_get_quick_print")) {
                 $was = snmp_get_quick_print();
                 snmp_set_quick_print(1);
             }
             if (function_exists("snmp_get_valueretrieval")) {
                 $was2 = snmp_get_valueretrieval();
             }
             if (function_exists('snmp_set_oid_output_format')) {
                 snmp_set_oid_output_format(SNMP_OID_OUTPUT_NUMERIC);
             }
             if (function_exists('snmp_set_valueretrieval')) {
                 snmp_set_valueretrieval(SNMP_VALUE_PLAIN);
             }
             if ($in_oid != '-') {
                 $in_result = snmpget($host, $community, $in_oid, $timeout, $retries);
                 if ($in_result) {
                     $data[IN] = floatval($in_result);
                     $item->add_hint("snmp_in_raw", $in_result);
                 } else {
                     $this->down_cache[$host]++;
                 }
             }
             if ($out_oid != '-') {
                 $out_result = snmpget($host, $community, $out_oid, $timeout, $retries);
                 if ($out_result) {
                     // use floatval() here to force the output to be *some* kind of number
                     // just in case the stupid formatting stuff doesn't stop net-snmp returning 'down' instead of 2
                     $data[OUT] = floatval($out_result);
                     $item->add_hint("snmp_out_raw", $out_result);
                 } else {
                     $this->down_cache[$host]++;
                 }
             }
             debug("SNMP ReadData: Got {$in_result} and {$out_result}\n");
             $data_time = time();
             if (function_exists("snmp_set_quick_print")) {
                 snmp_set_quick_print($was);
             }
         } else {
             warn("SNMP for {$host} has reached {$abort_count} failures. Skipping. [WMSNMP01]");
         }
     }
     debug("SNMP ReadData: Returning (" . ($data[IN] === NULL ? 'NULL' : $data[IN]) . "," . ($data[OUT] === NULL ? 'NULL' : $data[OUT]) . ",{$data_time})\n");
     return array($data[IN], $data[OUT], $data_time);
 }
<?php

require_once dirname(__FILE__) . '/snmp_include.inc';
echo "Checking error handling\n";
var_dump(snmp_get_quick_print('noarg'));
var_dump(snmp_set_quick_print('noarg'));
var_dump(snmp_set_quick_print());
echo "Checking working\n";
var_dump(snmp_get_quick_print());
snmp_set_quick_print(false);
var_dump(snmp_get_quick_print());
snmp_set_quick_print(true);
var_dump(snmp_get_quick_print());