PHP：如何检查函数中是否包含给定文件（）

Question

I have a PHP file that can be include'd() in various places inside another page. I want to know whether it has been included inside a function. How can I do this? Thanks.

Answer 1

There's a function called debug_backtrace() that will return the current call stack as an array. It feels like a somewhat ugly solution but it'll probably work for most cases:

$allowedFunctions = array('include', 'include_once', 'require', 'require_once');
foreach (debug_backtrace() as $call) {
    // ignore calls to include/require
    if (isset($call['function']) && !in_array($call['function'], $allowedFunctions)) {
        echo 'File has not been included in the top scope.';
        exit;
    }
}