title: Laravel multiple whereIn array
body: <p>I was wondering if there is a way to use whereIn with an array of arrays, 
  something like the where with array</p>
  
  <pre><code>User::where(['user_id' =&gt; $currentUser, 'group_id' =&gt; $currentGroup]);
  </code></pre>
  
  <p>so i'm looking for this:</p>
  
  <pre><code>User::whereIn(['group' =&gt; $availableGroups, 'session' =&gt; $currentSessions]).
  </code></pre>
  
  <p>which should be equivalent to using the whereIn clause twice.</p>
  
  <p>I was thinking of solving this like:</p>
  
  <pre><code>foreach (query as $key =&gt; $value)
     $userQuery-&gt;whereIn($key, $value);
  </code></pre>
  
  <p>I was wondering if there is a better way.</p>