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POHow do you store random parts of an array within an array and then print as a list?
 

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  1. POHow do you store random parts of an array within an array and then print as a list?
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    <p><strong>Follow-up question: <a href="https://stackoverflow.com/questions/18281343/how-to-randomly-take-examples-from-arrays-shuffle-them-and-place-them-into-a-ne">How to randomly take some examples from arrays, shuffle them and place them into a new array to be formatted as a list</a></strong></p> <p>How do you store random parts of an array within an array and then print as a list?</p> <p>I know that there are answers to both parts of my question already, but the two answers I found aren't compatible with each other. I'm trying to do this with PHP, but i'm willing to use another code language if absolutely necessary.</p> <p>I made up a simple version of what I've tried to do so far. I would like to store one random question from each array ($mars, $jupiter and $earth) as another array ($all) and then reformat this array as a list to be displayed as html (using &lt; ul > and &lt; li >).</p> <p>For some reason, the first function wants the =>array(), but the second doesn't.</p> <p>This makes a formatted html-style list from an array (replace $all with the array you want to format)</p> <pre><code>function makeList($all) { //Base case: an empty array produces no list if (empty($all)) return ''; //Recursive Step: make a list with child lists $output = '&lt;ul&gt;'; foreach ($all as $key =&gt; $subArray) { $output .= '&lt;li&gt;' . $key . makeList($subArray) . '&lt;/li&gt;'; } $output .= '&lt;/ul&gt;'; return $output; } </code></pre> <p>Here I'm just making the arrays. The =>array() is needed for the formatting above. I don't know why.</p> <pre><code>$mars = array ('How big is Mars?'=&gt;array(), 'How many moons does Mars have?'=&gt;array(), 'How far away is Mars?'=&gt;array(), 'What is the highest point on Mars?'=&gt;array()); $jupiter = array ('How big is Jupiter?'=&gt;array(), 'How many moons does Jupiter have?'=&gt;array(), 'How far away is Jupiter?'=&gt;array(), 'What is the highest point on Jupiter?'=&gt;array()); $earth = array ('How big is Earth?'=&gt;array(), 'How many moons does Earth have?'=&gt;array(), 'How far away is Earth?'=&gt;array(), 'What is the highest point on Earth?'=&gt;array()); //An array of the three arrays $all = array ($mars, $jupiter, $earth); </code></pre> <p>This prints the formatted version of $all</p> <pre><code>echo makeList ($all); </code></pre> <p>This is randomly taking two questions from the array $marz and printing them</p> <pre><code>$marz = array ('How big is Mars?', 'How many moons does Mars have?', 'How far away is Mars?', 'What is the highest point on Mars?'); $rand_keys = array_rand($marz, 2); echo $marz[$rand_keys[0]] . "\n"; echo $marz[$rand_keys[1]] . "\n"; </code></pre> <p>Here I am storing these results in a new array and printing it as proof in ugly array form</p> <pre><code>$new = array ($marz[$rand_keys[0]], $marz[$rand_keys[1]]); print_r ($new); </code></pre>
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    1. COWhat is the problem? what is the output you're expecting? and what is the output you are getting?
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      1. USKhalid Dabjan
    2. COHow far away IS Earth?
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      1. POHow do you store random parts of an array within an array and then print as a list?
      1. USOrangepill
    3. COI was expecting a list generated from one random question from each of the original arrays. webfix fixed my problem.
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      1. USAlex
 

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