temporary fix for the web stub

src/Silex/Compiler.php

@@ -105,9 +105,10 @@ class Compiler
 
 require_once __DIR__.'/autoload.php';
 
-$command = isset($argv[1]) ? $argv[1] : null;
+if ('cli' === php_sapi_name()) {
+    $command = isset($argv[1]) ? $argv[1] : null;
 
-switch ($command) {
+    switch ($command) {
         case 'update':
             $remoteFilename = 'http://silex-project.org/get/silex.phar';
             $localFilename = getcwd().'/silex.phar';
@@ -128,6 +129,7 @@ switch ($command) {
         default:
             printf("Silex version %s\n", Silex\Application::VERSION);
             break;
+    }
 }
 
 __HALT_COMPILER();