title: Compare two arrays, is there common elements between the two arrays?
body: <p>I need to test if one element of an array is in another array.</p>
  
  <pre><code>$array_one = array("gogo", "blabla", "toto");
  
  $array_two = array("stackov", "renaul", "toto");
  </code></pre>
  
  <p>I would like to know if one element of <code>array_one</code> is in <code>array_two</code> ???</p>
  
  <p>How to test that? Am trying <code>in_array</code> but it seems to have problems.</p>