随机化数组元素，保持关联键值对 - randomise array elements preserving assoc key value pairs

randomise array elements preserving assoc key value pairs

我正在构建一个测验应用程序。非常简单。只剩下最后一点了，我被困住了。我想随机选择答案。查看代码中的注释，我在CAPS中有问题。Shuffle正在工作，但它将assoc数组更改为数字0 1等。Array_rand使foreach不能工作并抛出错误。提供无效参数。我不知道出了什么问题，有人能帮帮我吗?

        <form action="<?php echo URL?>load=quiz&page=<?php echo $page; ?>" method="post" name="quiz">
        <?php //var_dump($quiz_data); 
            $all_ans_opts = array();
            $ans_opts = array_filter($all_ans_opts);;

        ?>
        <?php foreach($quiz_data as $d):
                $all_ans_opts['answer_a'] = $d['answer_a'];
                $all_ans_opts['answer_b'] = $d['answer_b'];
                $all_ans_opts['answer_c'] = $d['answer_c'];
                $all_ans_opts['answer_d'] = $d['answer_d'];
                $all_ans_opts['answer_e'] = $d['answer_e'];
       ?>
        <!-- If the question type is MC show the radio form-->

        <p>                    
        Question <?php echo $d['question_number']; ?>: <?php echo $d['question_title'] ; ?>
        </p>
        <p>
           <input type="hidden" name="page_num" value="<?php echo $page; ?>">
           <input type="hidden" name="question_number" value="<?php echo $d['question_number']; ?>">
           <input type="hidden" name="questionid" value="<?php echo $d['questionid']; ?>">
           <input type="hidden" name="quiz_number" value="<?php echo $d['quiz_number']; ?>">
        <?php
        endforeach; 
        //var_dump($all_ans_opts);

            ?>
               <?php 
// HERE I AM TRYING TO RANDAMISE THE ARRAY ELEMENTS PRESERVING KEY VALUE PAIRS FOR FOREACH
// FOR RANDAMISATION IF I USE SHUFFLE IT WORKS BUT CHANGING THE KEY FROM ASSOCIATIVE TO //INDEX 0 1 ETC.. 
// IF I USE ARRAY_RAND FUNCTION FOREACH GIVES ERROR- nvalid argument supplied for foreach()
               $ans_opts = array_filter($all_ans_opts);
               shuffle($all_ans_opts);                     
               //$ans_opts = array_rand($all_ans_opts);
           ?>
           <?php foreach ($ans_opts as $key=>$val){ ?>
            <input type="radio" name="<?php echo 'answer_selected';?>" value=<?php echo $key ?>><?php echo $val; ?><br/>
           <?php } ?>
        </p>

        <input type="submit" name="prev" value="Previous Question" <?php if($page == 0) echo "disabled";?> />                
        <input type="submit" name="save" value="<?php if($page == $totalQuestion-1)echo 'Submit Quiz'; else{echo 'Save & Continue';} ?>" />
        <input type="submit" name="next" value="Next Question" <?php if($page == $totalQuestion-1) echo "disabled";?> />
    </form>

简单的方法是使用uasort() -它在排序时保留键。要随机化，只需使用random sort:

$array = [
  'foo'=>14,
  'bar'=>10,
  'baz'=>19,
  'bee'=>26,
  'feo'=>23
];
uasort($array, function($x,$y)
{
   //you can use `return mt_rand(0,1)` - but that's
   //unreliable, since compare function must return -1/0/1
   return mt_rand() - mt_rand();
});

我在手册中找到了一个函数:

http://pl1.php.net/shuffle 94697