Get code line and file name that's executing processing the current function in PHP

function log() {
    try {
        $bt = debug_backtrace();
        $fileAndLine = "";
        for ($i = 0; $i < 10; $i++) {
            $row = $bt[$i];
            if (isset($row["file"]) && isset($row["line"])) {
                $fileAndLine = $row["file"] . "::" . $row["line"];
                $i = 50;
            }
        }
        return $fileAndLine;
    }
    catch (Exception $ex) {
        return "";
    }
}