PHP：从数组中回显随机值取决于另一个先前的值，也是随机的

Question

我需要根据 array_rand() 的先前结果回显一系列四个字符串。到目前为止，我有这个：

<?php

$titles = array('title1','title2','title3','title4');

$title1_words = array('word1','word2','word3','word4','word5','word6','word7');
$title2_words = array('word1','word2','word3','word4','word5','word6','word7');
$title3_words = array('word1','word2','word3','word4','word5','word6','word7');
$title4_words = array('word1','word2','word3','word4','word5','word6','word7');

$rand_title = array_rand($titles, 1);
echo $rand_title . "<br>";


//print 4 random words from one group
$rand_words = array_rand($title1_words, 4);
echo $title1_words[$rand_words[0]] . "<br>";
echo $title1_words[$rand_words[1]] . "<br>";
echo $title1_words[$rand_words[2]] . "<br>";
echo $title1_words[$rand_words[3]] . "<br>";

?>

我需要输出类似于：

“标题2

word2, word4, word5, word7"，这些词实际上与主标题相关。

（单词因组而异。我只是使用相同的名称以便更容易理解。）

每次我刷新页面时都会回显不同的值。

// 为进一步解释编辑 //

当它刷新时，它应该回显另一个标题和与该标题相关的另一组 4 个单词。

P.S.：Srsly，为什么投反对票？至少解释一下。

Answer 1

正如 cmets 中所解释的，处理此问题的最佳方法是将您的单词存储在二维数组中，如下所示：

$words = array(
    'title1' => array('word1','word2','word3','word4','word5','word6','word7')),
    'title2' => array('word1','word2','word3','word4','word5','word6','word7')),
    'title3' => array('word1','word2','word3','word4','word5','word6','word7')),
    'title4' => array('word1','word2','word3','word4','word5','word6','word7')),
);

然后使用$words[$titles[$rand_title]] 作为你的单词子数组。

但是，如果您不能（或绝对不想）使用二维数组，您可以始终使用 variable variables：

<?php

$titles = array('title1','title2','title3','title4');

$title1_words = array('word1','word2','word3','word4','word5','word6','word7');
$title2_words = array('word1','word2','word3','word4','word5','word6','word7');
$title3_words = array('word1','word2','word3','word4','word5','word6','word7');
$title4_words = array('word1','word2','word3','word4','word5','word6','word7');

$rand_title = array_rand($titles, 1);
echo $rand_title . "<br>";

$title = $titles[$rand_title]; // should be title2, for instance
$words_array = ${$title . '_words'}; // should be $title2_words, for instance

$rand_words = array_rand($words_array, 4);
echo $words_array[$rand_words[0]] . "<br>";
echo $words_array[$rand_words[1]] . "<br>";
echo $words_array[$rand_words[2]] . "<br>";
echo $words_array[$rand_words[3]] . "<br>";

?>