php如何获取请求路径？
解决方法：
获取当前请求路径并赋值给REQUEST_URI
define('REQUEST_URI', $_SERVER['REQUEST_URI'] ? $_SERVER['REQUEST_URI'] : htmlentities($_SERVER['PHP_SELF']) .'?'.htmlentities($_SERVER['QUERY_STRING']));
结果：/projectName/index.php?lang=cn
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