Smarty v5 update test, initial code setup

src/Compile/Modifier/LowerModifierCompiler.php

@@ -0,0 +1,19 @@
+<?php
+namespace Smarty\Compile\Modifier;
+/**
+ * Smarty lower modifier plugin
+ * Type:     modifier
+ * Name:     lower
+ * Purpose:  convert string to lowercase
+ *
+ * @author Monte Ohrt <monte at ohrt dot com>
+ * @author Uwe Tews
+ */
+
+class LowerModifierCompiler extends Base {
+
+	public function compile($params, \Smarty\Compiler\Template $compiler) {
+		return 'mb_strtolower((string) ' . $params[ 0 ] . ', \'' . addslashes(\Smarty\Smarty::$_CHARSET) . '\')';
+	}
+
+}