function ScopedInclude($file,$params = array())
{
    extract($params);
    include $file;
}

然后A.PHP可以像这样包含C.PHP：

<?PHP
// A.PHP
ScopedInclude('C.PHP',array('includerFile' => __FILE__));

另外,B.PHP可以同样方式包含C.PHP而不会有麻烦.

<?PHP
// B.PHP
ScopedInclude('C.PHP',array('includerFile' => __FILE__));

C.PHP可以通过查看$params数组来了解其包含者.

<?PHP
// C.PHP
echo $includerFile;