失败的开放包括_once和session

Question

我想在浏览到我的.php文件时随机包含HTML文件。我不希望在刷新时彼此之间两次可以显示同一页。

我以为我可以使用会话来实现这一目标，但是在规则28上的某些时间似乎会遇到一些错误（包括_once（$ htmls [$ rand]）;）：

Notice: Undefined index: in C:UsersRoderikDocumentsCasimirrootfinal.php on line 28
Warning: include_once(C:UsersRoderikDocumentsCasimirroot): failed to open stream: Permission denied in C:UsersRoderikDocumentsCasimirrootfinal.php on line 28
Warning: include_once(): Failed opening '' for inclusion (include_path='.;C:phppear') in C:UsersRoderikDocumentsCasimirrootfinal.php on line 28

我正在使用USB-Webserver进行测试。

我的代码：

session_start();
global $htmls;
global $arrlength;
//get all .html's withing ./pages
$htmls = glob('./pages/*.html');
$arrlength = count($htmls) - 1 ;

if (isset($_SESSION['rand'])) {
    $session_rand = $_SESSION['rand'];
    $rand = rand(0, $arrlength);
    if($rand !== $session_rand)
    {
        $_SESSION['rand'] = $rand;
        include_once($htmls[$rand]);
    }
    else
    {
        $rand = getNewRandom($session_rand, $arrlength);
        $_SESSION['rand'] = $rand;
        include_once($htmls[$rand]);
    }
}
else
{
    $rand = rand(0, $arrlength);
    $_SESSION['rand'] = $rand;
    include_once($htmls[$rand]);
}
function getNewRandom($exception, $arrlength)
{
    $rand = rand(0, $arrlength);
    if($rand == $exception)
    {
        getNewRandom($exception, $arrlength);
    }
    else
    {
        return $rand;
    }
}

Answer 1

作为错误

Notice: Undefined index: in C:UsersRoderikDocumentsCasimirrootfinal.php on line 28

说，$rand您正在使用$htmls[$rand]中的索引未定义，并返回一个null，该null被视为include()中的一个空字符串，因此您有效地运行

include('')

在您的include()呼叫之前，请立即进行var_dump($htmls)和echo $rand，然后查看您要使用的内容。

Answer 2

您使事情复杂化。以下将确保连续两次不包括文件。

// Files
$htmls = glob('test/*.html');
// Get the key of the previously included file
$previous = false;
if ( isset($_SESSION['rand']) ) {
    $previous = $_SESSION['rand'];  
}
// If a file was previously included, remove it from the pool
if ( $previous !== false && isset($htmls[$previous]) ) {
    unset($htmls[$previous]);
}
// Get a random key from available files
$key = $_SESSION['rand'] = array_rand($htmls);
// File to include
$include = $htmls[$key];