cakephp中的翻译返回无效字符

Question

我正在开发cakephp项目，我将我网站的内容从英语翻译成阿拉伯语。我正在使用cakephp默认翻译。英语到阿拉伯语的翻译工作正常，但翻译后有一些无效的字符。我正在回复以下字符串： -

<?php echo __('DISCOVER_PLACES'); ?>

I want to echo the DISCOVER_PLACES in arabic. But i am getting following result:-

اكتش�? أماكن جديدة

There are some invalid characters �? How to solve this? Any help will be appreciated. Thanks in Advance.