title: array_intersect_key with three array in php
body: <p>I have three array from dynamic data in php for example :</p>
  
  <pre><code>array1 = array('10-11-2015'=&gt;23.6,
                 '25-11-2015'=&gt;48.6,
                 '12-11-2015'=&gt;14.52);
  
  array2 = array('10-11-2015'=&gt;8.7,
                 '22-10-2015'=&gt;86.6,
                 '12-11-2015'=&gt;78.5);
  
  array3 = array('10-11-2015'=&gt;5.8,
                 '19-09-2015'=&gt;3.6,
                 '12-11-2015'=&gt;96.4);
  </code></pre>
  
  <p>I just need common keys from this three array</p>
  
  <pre><code>newarray = array('10-11-2015','12-11-2015');
  </code></pre>
  
  <p>I use <code>array_intersect_key</code> but it is for only two array. </p>
  
  <p>How I can get it form three or more array ?</p>