Класс SNMP

Hopefully this helps someone else out because this was driving be bonkers for a good two hours. It looks like valueretrieval and enum_print work together in a way that I wasn't expecting, and after re-reading may be by design but I'm not sure. If you can't get enums to print, this might be why.
<?php
 $snmp = new SNMP(SNMP::VERSION_2C,'192.168.1.9','test');
 $snmp->oid_output_format = SNMP_OID_OUTPUT_SUFFIX;
 $snmp->valueretrieval = SNMP_VALUE_PLAIN;
 $snmp->enum_print = 0;
 echo $snmp->get('IF-MIB::ifOperStatus.10110') . "\n";
 $snmp->enum_print = 1;
 echo $snmp->get('IF-MIB::ifOperStatus.10110') . "\n";
 $snmp->quick_print = 1;
 echo $snmp->get('IF-MIB::ifOperStatus.10110') . "\n";
 $snmp->valueretrieval = SNMP_VALUE_LIBRARY;
 echo $snmp->get('IF-MIB::ifOperStatus.10110') . "\n";
 $snmp->enum_print = 0;
 echo $snmp->get('IF-MIB::ifOperStatus.10110') . "\n";
?>

Output:
1
1
1
1
up

Part of my diploma thesis was to create web interface to command device via SNMP. So I create my own level of abstraction over SNMP class:
<?php
/**
 * Snmp library which add one level of abstraction to snmp native library.
 * It adds functionality to work with module PicoIP.With this library you can:
 * 1.Activate/deactive defined pin;
 * 2.Get status of all pins.
 * 
 * When make an instance you should pass to the constructor key word which will
 * make the library create an object with necessary properetis and access permissions.
 * 
 * Private properties set some of configurations:
 * Host is IP address of the divece which we will command.
 * Two passwords are set for reading and writing.
 * Version of snmp protocol that we will use is version 1.
 * 
 * @author Radoslav Madjev
 * @year 2016
 * @version 1.0 beta
 * 
 * 
 */
class snmp_lib {
 private $snmpInstance;
 private $VERSION = SNMP::VERSION_1;
 private $HOST = '192.168.0.150';
 private $passwordRead = '000000000000';
 private $passwordWrite = 'private';
 private $releys = array(1 => '1.3.6.1.4.1.19865.1.2.1.1.0',
 2 => '1.3.6.1.4.1.19865.1.2.1.2.0');
 private $allPorts = array('3' => '1.3.6.1.4.1.19865.1.2.1.33.0',
 '5' => '1.3.6.1.4.1.19865.1.2.2.33.0');
 /**
 * Create instance of SNMP native class, based on actions that we will
 * perform.
 * 
 * @param string $action
 */
 public function __construct($action) {
 if (in_array($action, array('read', 'write'))) {
 if (strcmp($action, 'read') === 0) {
 $this->_read();
 } else {
 $this->_write();
 }
 }
 }
 /**
 * Create instance with reading permissions.
 */
 private function _read() {
 $this->snmpInstance = new SNMP($this->VERSION, $this->HOST, $this->passwordRead);
 }
 /**
 * Create instance with writing permissions.
 */
 private function _write() {
 $this->snmpInstance = new SNMP($this->VERSION, $this->HOST, $this->passwordWrite);
 }
 /**
 * Close snmp session.
 * 
 * @return boolean
 */
 public function closeSession() {
 return $this->snmpInstance->close();
 }
 /**
 * Set integer 1 as value of defined pin.
 */
 public function activate($relay) {
 $this->snmpInstance->set($this->releys[$relay], 'i', '1');
 }
 /**
 * Set integer 0 as value of defined pin.
 */
 public function deactivate($relay) {
 $this->snmpInstance->set($this->releys[$relay], 'i', '0');
 }
 /**
 * Get pin status of all ports of the module.
 * 
 * @return array
 */
 public function getAllPortsStatus() {
 $allPins = array();
 foreach ($this->allPorts as $number => $port) {
 //get active pins as 8-bit integer of defined port
 $getbits = $this->snmpInstance->get($port);
 $bits = str_replace('INTEGER: ', '', $getbits);
 //get pins status
 $pinsStatus = $this->_getActivePins($bits);
 $allPins[$number] = $pinsStatus;
 }
 return $allPins;
 }
 /**
 * Make bitwise operation which will determine,
 * which are active pins.
 * 
 * @param int $bits
 * @return array
 */
 private function _getActivePins($bits) {
 $bitMapping = array(
 1 => 1,
 2 => 2,
 3 => 4,
 4 => 8,
 5 => 16,
 6 => 32,
 7 => 64,
 8 => 128
 );
 $pinsStatus = array();
 foreach ($bitMapping as $int => $bit) {
 if (($bits & $bit) == $bit) {
 $pinsStatus[$int] = true;
 continue;
 }
 $pinsStatus[$int] = false;
 }
 return $pinsStatus;
 }
}
?>

I have one module that receive SNMP request and send a command to relays. Also these are example scripts that use this lib:
Turn on script:
<?php
require_once 'snmp_lib.php';
$snmp = new snmp_lib('write');
$snmp->activate($getRelayNumber);
$snmp->closeSession();
?>

Turn off script:
<?php
require_once 'snmp_lib.php';
$snmp = new snmp_lib('write');
$snmp->deactivate($getRelayNumber);
$snmp->closeSession();
?>

Script that get all ports status:
<?php
require_once 'snmp_lib.php';
$snmp = new snmp_lib('read');
$getActive = $snmp->getAllPortsStatus();
?>