Add ZK library classes for device interaction and user management

- Implemented Os class for retrieving OS information.
- Added Pin class for getting PIN width.
- Created Platform class for fetching platform details and version.
- Developed SerialNumber class to retrieve device serial number.
- Introduced Ssr class for SSR information retrieval.
- Implemented Time class for setting and getting device time.
- Added User class for user management including setting, getting, clearing, and removing users.
- Created Util class with various utility functions for command handling and data processing.
- Implemented Version class for fetching device version.
- Added WorkCode class for retrieving work code information.
- Set up Composer autoloading for the ZK library.

zklib/src/Connect.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace ZK;
+
+use ZKLib;
+use ErrorException;
+use Exception;
+
+class Connect
+{
+    /**
+     * @param ZKLib $self
+     * @return bool
+     */
+    public function connect(ZKLib $self)
+    {
+        $self->_section = __METHOD__;
+
+        $command = Util::CMD_CONNECT;
+        $command_string = '';
+        $chksum = 0;
+        $session_id = 0;
+        $reply_id = -1 + Util::USHRT_MAX;
+
+        $buf = Util::createHeader($command, $chksum, $session_id, $reply_id, $command_string);
+
+        socket_sendto($self->_zkclient, $buf, strlen($buf), 0, $self->_ip, $self->_port);
+
+        try {
+            @socket_recvfrom($self->_zkclient, $self->_data_recv, 1024, 0, $self->_ip, $self->_port);
+            if (strlen($self->_data_recv) > 0) {
+                $u = unpack('H2h1/H2h2/H2h3/H2h4/H2h5/H2h6', substr($self->_data_recv, 0, 8));
+
+                $session = hexdec($u['h6'] . $u['h5']);
+                if (empty($session)) {
+                    return false;
+                }
+
+                $self->_session_id = $session;
+                return Util::checkValid($self->_data_recv);
+            } else {
+                return false;
+            }
+        } catch (ErrorException $e) {
+            return false;
+        } catch (Exception $e) {
+            return false;
+        }
+    }
+
+    /**
+     * @param ZKLib $self
+     * @return bool
+     */
+    public function disconnect(ZKLib $self)
+    {
+        $self->_section = __METHOD__;
+
+        $command = Util::CMD_EXIT;
+        $command_string = '';
+        $chksum = 0;
+        $session_id = $self->_session_id;
+
+        $u = unpack('H2h1/H2h2/H2h3/H2h4/H2h5/H2h6/H2h7/H2h8', substr($self->_data_recv, 0, 8));
+        $reply_id = hexdec($u['h8'] . $u['h7']);
+
+        $buf = Util::createHeader($command, $chksum, $session_id, $reply_id, $command_string);
+
+
+        socket_sendto($self->_zkclient, $buf, strlen($buf), 0, $self->_ip, $self->_port);
+        try {
+            @socket_recvfrom($self->_zkclient, $self->_data_recv, 1024, 0, $self->_ip, $self->_port);
+
+            $self->_session_id = 0;
+            return Util::checkValid($self->_data_recv);
+        } catch (ErrorException $e) {
+            return false;
+        } catch (Exception $e) {
+            return false;
+        }
+    }
+}