IHF: Str helpers added.

Author: dmitry-ivanov

src/str.php

@@ -0,0 +1,17 @@
+<?php
+
+use Illuminate\Support\Str;
+
+if (!function_exists('str_lower')) {
+    function str_lower($string)
+    {
+        return Str::lower($string);
+    }
+}
+
+if (!function_exists('str_upper')) {
+    function str_upper($string)
+    {
+        return Str::upper($string);
+    }
+}