Update README.md

Author: CreativeDream

README.md

@@ -25,7 +25,7 @@ $data = $uploader->upload($_FILES['files'], array(
     'onSuccess' => null, //A callback function name to be called if all files were successfully uploaded | ($files, $metas) | Callback
     'onUpload' => null, //A callback function name to be called if all files were successfully uploaded (must return an array) | ($file) | Callback
     'onComplete' => null, //A callback function name to be called when upload is complete | ($file) | Callback
-    'onRemove' => null //A callback function name to be called by removing files (must return an array) | ($removed_files) | Callback
+    'onRemove' => 'onFilesRemoveCallback' //A callback function name to be called by removing files (must return an array) | ($removed_files) | Callback
 ));
 
 if($data['isComplete']){
@@ -37,6 +37,18 @@ if($data['hasErrors']){
     $errors = $data['errors'];
     print_r($errors);
 }
+
+function onFilesRemoveCallback($removed_files){
+    foreach($removed_files as $key=>$value){
+        $file = '../uploads/' . $value;
+        if(file_exists($file)){
+            unlink($file);
+            unset($removed_files[$key]);
+        }
+    }
+    
+    return $removed_files;
+}
 ~~~~
 
 __Download:__