Throw exception if not running on 64 bit system

README.md

@@ -6,7 +6,7 @@ Created by [Daniil Gentili](https://daniil.it), licensed under AGPLv3.
 
 PHP implementation of MTProto, based on [telepy](https://github.com/griganton/telepy_old).
 
-This project can run on PHP 7, PHP 5.6 and HHVM.  
+This project can run on PHP 7, PHP 5.6 and HHVM, only 64 bit systems are supported ATM.  
 
 Also note that MadelineProto will perform better if a big math extension like gmp o bcmath is installed.
 

src/danog/MadelineProto/MTProto.php

@@ -38,6 +38,11 @@ class MTProto extends MTProtoTools
 
     public function __construct($settings = [])
     {
+        // Detect 64 bit
+        if (PHP_INT_SIZE < 8) {
+            throw new Exception('MadelineProto supports only 64 bit systems ATM');
+        }
+
         // Detect ipv6
         $google = '';
         try {