feat: add missing function to_boolean

Signed-off-by: romanetar <roman_ag@hotmail.com>

Author: romanetar

app/Utils/helpers.php

@@ -0,0 +1,27 @@
+<?php
+/*
+ * Copyright 2023 OpenStack Foundation
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+if (!function_exists('to_boolean')) {
+
+    /**
+     * Convert to boolean
+     *
+     * @param $booleable
+     * @return boolean
+     */
+    function to_boolean($booleable)
+    {
+        return filter_var($booleable, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
+    }
+}