PHP获取每日BING图，并缓存URL到本地JSON

images[0])) {
        $impurely = 'https://cn.bing.com' . $str->images[0]->url;
    } else {
        $impurely = false;
    }
    if ($impurely) {
        global $contents;
        if ($contents['url'] !== $impurely) {
            global $filename;
            $data = array(
                "time" => date("Ymd"),
                "url" => $impurely
            );
            $data = json_encode($data);
            file_put_contents($filename, $data);
        }
        Header("Location: " . $impurely);
        exit();
    } else {
        exit('error');
    }
}
?>