WhoIncludedThisFile

whoincludedthisfile.php

function whoIncludedThisFile() {
    $bt = debug_backtrace();
    $includedMe = false;
    while (count($bt) > 0) {
        $set = array_shift($bt);
        if (
            array_key_exists('function', $set) === true &&
            in_array($set['function'], array('require', 'require_once', 'include', 'include_once'))
        ){
            $includedMe = array('file'=>$set['file'], 'line'=>$set['line']);
            break;
        }
    }
    return $includedMe;
}

print_r(whoIncludedThisFile());
// Array ( [file] => topLevelFile.php [line] => 2 )