Add save to file method

Utils/Barcode/C128Abstract.php

@@ -227,6 +227,40 @@ abstract class C128Abstract
         return $this->createImage($codeString, 20);
     }
 
+    /**
+     * Save to file
+     *
+     * @param string $file File path/name
+     * 
+     * @return void
+     *
+     * @since  1.0.0
+     */
+    public function saveToPngFile(string $file) /* : void */
+    {
+        $res = $this->get();
+
+        imagepng($res, $file);
+        imagedestroy($res);
+    }
+
+    /**
+     * Save to file
+     *
+     * @param string $file File path/name
+     * 
+     * @return void
+     *
+     * @since  1.0.0
+     */
+    public function saveToJpgFile(string $file) /* : void */
+    {
+        $res = $this->get();
+
+        imagejpeg($res, $file);
+        imagedestroy($res);
+    }
+
     /**
      * Generate weighted code string
      *