title: How to filter array and create new array
body: <p>I have two arrays: <code>array1=(1,2,3,4)</code> and <code>array2=(1,2,5,6)</code></p>
  
  <p>I need to create <code>array3</code> which contain only those value which lie in <code>array2</code> not in <code>array1</code>. So my array3 will be <code>array3(5,6)</code>.</p>