php - 防止通过刷新重新获取数据

Question

我正在创建一个在线测验。我正在从数据库中获取随机问题并将其显示给用户。通过刷新页面将发出另一个请求，用户将得到一组不同的问题。如何防止这种情况

Answer 1

基于 Nemoden's comment :

<?php
// start session
session_start();

// if questions were not fetched for this session yet...
if( !isset( $_SESSION[ 'questions' ] ) )
{
    // fetch questions and put in $_SESSION[ 'questions' ]
    $_SESSION[ 'questions' ] = fetchRandomQuestionsFromDatabase();
}

// loop through $_SESSION[ 'questions' ] and do something with each question
foreach( $_SESSION[ 'questions' ] as $question )
{
    // print question, or something
}