A few code optimisations.

src/Entities/KeyboardButton.php

@@ -35,7 +35,7 @@ class KeyboardButton extends Entity
      * @param array $data
      * @throws \Longman\TelegramBot\Exception\TelegramException
      */
-    public function __construct($data = array())
+    public function __construct(array $data = [])
     {
         $this->text = isset($data['text']) ? $data['text'] : null;
         if (empty($this->text)) {

src/Entities/ReplyKeyboardMarkup.php

@@ -40,27 +40,29 @@ class ReplyKeyboardMarkup extends Entity
      * ReplyKeyboardMarkup constructor.
      *
      * @param array $data
+     *
      * @throws \Longman\TelegramBot\Exception\TelegramException
      */
-    public function __construct($data = array())
+    public function __construct(array $data = [])
     {
-        if (isset($data['keyboard'])) {
-            if (is_array($data['keyboard'])) {
+        if (!isset($data['keyboard'])) {
+            throw new TelegramException('Keyboard field is empty!');
+        }
+
+        if (!is_array($data['keyboard'])) {
+            throw new TelegramException('Keyboard field is not an array!');
+        }
+
         foreach ($data['keyboard'] as $item) {
             if (!is_array($item)) {
                 throw new TelegramException('Keyboard subfield is not an array!');
             }
         }
         $this->keyboard = $data['keyboard'];
-            } else {
-                throw new TelegramException('Keyboard field is not an array!');
-            }
-        } else {
-            throw new TelegramException('Keyboard field is empty!');
-        }
 
-        $this->resize_keyboard   = isset($data['resize_keyboard']) ? $data['resize_keyboard'] : false;
-        $this->one_time_keyboard = isset($data['one_time_keyboard']) ? $data['one_time_keyboard'] : false;
-        $this->selective         = isset($data['selective']) ? $data['selective'] : false;
+        //Set the object members from the passed data params
+        foreach (['resize_keyboard', 'one_time_keyboard', 'selective'] as $param) {
+            $this->$param = isset($data[$param]) ? (bool)$data[$param] : false;
+        }
     }
 }

src/Entities/ServerResponse.php

@@ -35,10 +35,12 @@ class ServerResponse extends Entity
      *
      * @param array $data
      * @param       $bot_name
+     *
+     * @throws \Longman\TelegramBot\Exception\TelegramException
      */
     public function __construct(array $data, $bot_name)
     {
-        if (isset($data['ok']) && isset($data['result'])) {
+        if (isset($data['ok'], $data['result'])) {
             if (is_array($data['result'])) {
                 if ($data['ok'] && !$this->isAssoc($data['result']) && !isset($data['result'][0]['user'])) {
                     //Get Update
@@ -49,7 +51,7 @@ class ServerResponse extends Entity
                     //Response from getChatAdministrators
                     $this->result = [];
                     foreach ($data['result'] as $user) {
-                        array_push($this->result, new ChatMember($user));
+                        $this->result[] = new ChatMember($user);
                     }
                 } elseif ($data['ok'] && $this->isAssoc($data['result'])) {
                     if (isset($data['result']['total_count'])) {
@@ -82,12 +84,7 @@ class ServerResponse extends Entity
                     $this->ok          = $data['ok'];
                     $this->result      = true;
                     $this->error_code  = null;
-
-                    if (isset($data['description'])) {
-                        $this->description = $data['description'];
-                    } else {
-                        $this->description = '';
-                    }
+                    $this->description = isset($data['description']) ? $data['description'] : '';
                 } elseif (is_numeric($data['result'])) {
                     //Response from getChatMembersCount
                     $this->result = $data['result'];
@@ -101,24 +98,9 @@ class ServerResponse extends Entity
         } else {
             //webHook not set
             $this->ok          = false;
-
-            if (isset($data['result'])) {
-                $this->result = $data['result'];
-            } else {
-                $this->result = null;
-            }
-
-            if (isset($data['error_code'])) {
-                $this->error_code = $data['error_code'];
-            } else {
-                $this->error_code = null;
-            }
-
-            if (isset($data['description'])) {
-                $this->description = $data['description'];
-            } else {
-                $this->description = null;
-            }
+            $this->result      = isset($data['result']) ? $data['result'] : null;
+            $this->error_code  = isset($data['error_code']) ? $data['error_code'] : null;
+            $this->description = isset($data['description']) ? $data['description'] : null;
 
             //throw new TelegramException('ok(variable) is not set!');
         }