Remove deprecated create_function and use ReflectionClass instead.

src/Libs/ModelMySQL.php

@@ -175,9 +175,16 @@ class ModelMySQL {
   * @return array
   *   Contiene los atributos indexados del objeto actual.
   */
-  private function getVars() { // Source: https://stackoverflow.com/questions/10009015/show-all-public-attributes-name-and-value-of-an-object
-    $get_vars_proxy = create_function('$obj', 'return get_object_vars($obj);');
-    $result = $get_vars_proxy($this);
+  private function getVars() { 
+    $reflection = new \ReflectionClass($this);
+    $properties = $reflection->getProperties(\ReflectionProperty::IS_PUBLIC);
+    $result = [];
+    
+    foreach($properties as $property) {
+      $att = $property->name;
+      $result[$att] = $this->$att;
+    }
+    
     foreach ($this->ignoreSave as $del) {
       unset($result[$del]);
     }