Question

在previous question中我没有意识到我自己无法添加其余的更改，所以这就是我正在使用的内容。用户webfix帮我解决了这个问题：

$mars = array ('How big is Mars?', 'How many moons does Mars have?', 'How far away is Mars?', 'What is the highest point on Mars?');
$jupiter = array ('How big is Jupiter?', 'How many moons does Jupiter have?', 'How far away is Jupiter?', 'What is the highest point on Jupiter?');
$earth = array ('How big is Earth?', 'How many moons does Earth have?', 'How far away is Earth?', 'What is the highest point on Earth?');
$sun = array ('How big is the Sun?', 'How many moons does the Sun have?', 'How far away is the Sun?', 'What is the highest point on the Sun?');

$all = array($mars, $jupiter, $earth, $sun);

function createList($a)
{
echo "<ul>";    
foreach ($a as $array) 
    {
    $questions = count($array);
    $idquestion = rand(0, $questions-1);
    echo "<li>" . $array[$idquestion]  . "</li>";
    }
echo "</ul>";
}

createList($all);

我现在想要添加一个问题顺序的随机化，以及最多三个（或以后要改变的任何数字）问题吐出来。

它目前将选择每个问题中的一个（$ mars，$ jupiter，$ earth，$ sun），然后按顺序将其列入一个列表。我希望订单是随机的，只能选择其中的三个。

我尝试使用“shuffle（$ all）”，但这不起作用，也许我们可以使用类似“for（$ i = 1; $ i＆lt; 4; $ i ++）”来制作它摘三后停下来？感谢。

Answer 1

shuffle($all)应该有效（对我有用），我不知道为什么它不适合你。要选择三个，请执行：

$mars = array ('How big is Mars?', 'How many moons does Mars have?', 'How far away is Mars?', 'What is the highest point on Mars?');
$jupiter = array ('How big is Jupiter?', 'How many moons does Jupiter have?', 'How far away is Jupiter?', 'What is the highest point on Jupiter?');
$earth = array ('How big is Earth?', 'How many moons does Earth have?', 'How far away is Earth?', 'What is the highest point on Earth?');
$sun = array ('How big is the Sun?', 'How many moons does the Sun have?', 'How far away is the Sun?', 'What is the highest point on the Sun?');

$all = array($mars, $jupiter, $earth, $sun);
shuffle($all);

function createList($a)
{
  echo "<ul>"; 
  $count = 1;

  foreach ($a as $array) 
    {
      $questions = count($array);
      $idquestion = rand(0, $questions-1);
      echo "<li>" . $array[$idquestion]  . "</li>";
      if ($count++ >= 3) {
        break;
      }
    }
  echo "</ul>";
}

createList($all);

break提前终止循环。

DEMO

如何从数组中随机取样，将它们混洗并将它们放入一个新的数组中以格式化为列表

1 个答案: