优化

@@ -115,7 +115,7 @@ class ImapClient {
         $bytesWritten = 0;
         $maxW = $this->timeOut*10;
         while ($bytesWritten < $totalBytes) {
-            $result = fwrite($this->socket, substr($cmd, $bytesWritten));
+            $result = @fwrite($this->socket, substr($cmd, $bytesWritten));
             // 写失败了
             if ($result === false) {    return false;   }
 
@@ -207,6 +207,8 @@ class ImapClient {
                     break;
                 }
             }
+        }else{
+            throw new \Exception($this->host.' write error '.$cmd);
         }
 
         return $result;