Notes on session_start in PHP7!

PHP7 Notes on session_start will cause the browser page not to update

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Please see the code

//PHP7中session_start 使用注意事项，
session_start([
    'cache_limiter' => 'private', //在读取完毕会话数据之后马上关闭会话存储文件//启用后，浏览器刷新时，页面将不再请求服务器刷新，只能使用CTRL+F5刷新才重新请求数据，慎用！
    'cookie_lifetime' => 3600 ,  //SessionID在客户端Cookie储存的时间，默认是0，代表浏览器一关闭SessionID就作废
        'read_and_close' => true   //在读取完会话数据之后， 立即关闭会话存储文件，不做任何修改//启用后不能修改，不能销毁SESSION
]);

$tmd = $_GET['tmd'] ?? 1;
refreshUrl("admin_login.php",$tmd);
/*浏览器刷新时，更新URL地址，防止页面缓存*/
function refreshUrl($url, $tmd)
{
    $waitTime = microtime(true) - $tmd;
    if ($waitTime > 1) {
        jmpUrl($url);
        die();
    }
}
/*url跳转加随机数，防止页面缓存*/
function jmpUrl($url)
{
    if (!strpos($url, '?')) {
        header("Refresh:0;url=" . $url . "?tmd=" . microtime(true));
    } else {
        header("Refresh:0;url=" . $url . "&tmd=" . microtime(true));
    }
}

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