title: Merging two arrays by keys
body: <p>So I have two arrays. </p>
  
  <pre><code>$user_ids = array('123','124','125');
  $names = array('john','bob','susie');
  </code></pre>
  
  <p>Now, all of those arrays are matched up. Meaning that 123 is the user_id for john, 124 is the user_id for Bob, etc. (So both arrays have matching keys)</p>
  
  <p>But I want to end up with a multidimensional array for each user with their user_id and name instead of having them seperate.</p>