title: Adding values to a multidimensional array PHP
body: <p>I have tried this now about 20 different ways, set it down and picked it back up several times and I am at a loss for what I am doing wrong.   I am trying to create an array of arrays from three separate arrays.  The first array I iterate through is a list of dates.  Then I iterate through a list of cabins (this is a simple camp scheduling program), and then I randomly assign an activity to each of the cabins from a third array.</p>
  
  <p>The three arrays are <code>$cabins</code>, <code>$activities</code>, and <code>$checkeddates</code></p>
  
  <pre><code>//swaps key-value so cabin names are keys
  $cabins = array_flip( $cabins );  
  //sets each key value pair to be cabinname=&gt; null
  erase_val( $cabins );
  
  foreach ( $checkeddates as $dates ) {
      $uberarray[] = $dates;
  }
  $uberarray = array_flip( $uberarray );
  foreach ( $uberarray as $k =&gt; $v ) {
      $uberarray[$k] = $cabins;
  }
  </code></pre>
  
  <p>At this point, a var_dump shows that I have an array of dates each containing an array of cabins names with null values, from this point I have tried a dozen things and this is just where I left it, trying a process of elimination to figure out what it isn't.</p>
  
  <pre><code>foreach ( $uberarray as $k =&gt; $v ) {
      shuffle( $activities );
      $s = $activities[0]; 
      $uberarray[] = $s;
  }
  </code></pre>
  
  <p>In the end, I was thinking to build the large array (with some additional rules not yet written in to prevent multiple assignments of the same thing and such.  And then as one function I would iterate through the established combinations in the array to write it to the database. </p>
  
  <p><strong>Edit</strong>:  Request for how I want it to look in the end:</p>
  
  <pre><code>array
    'ThuJan1st' =&gt;
       array 
         'cabin 1' =&gt; randomactivity1
         'cabin 2' =&gt; randomactivity2
         'cabin 3' =&gt; randomactivity3
  </code></pre>
  
  <p>Currently I have 2 out of 3, but I can not seem to randomly add the activities as values.</p>
  
  <p><strong>Edit</strong>:  This is what @kunal 's suggestion produced: </p>
  
  <pre><code>array
    'ThuJan1st' =&gt;
       array 
         'cabin 1' =&gt; randomactivity1
         'cabin 2' =&gt; randomactivity2
         'cabin 3' =&gt; randomactivity3
      array
    'FriJan2nd' =&gt;
       array 
         'cabin 1' =&gt; randomactivity4
         'cabin 2' =&gt; Null
         'cabin 3' =&gt; Null
  </code></pre>
  
  <p>Once it iterated through activities a single time, nothing else was assigned a value.</p>