title: PHPExcel search cell by value
body: <p>I'm wondering, how it's possible to help with such issue.
  Let's say, I have an excel with such info in it (it could be much more info):</p>
  
  <pre><code>**Country**            **Currency**
  Germany                 EUR    
  USA                     USD    
  Russia                  RUB
  </code></pre>
  
  <p>and I'm entering in input form "USA", and I want to see the result USD from excel. 
  Is there some kind of function in PHP, which allows to search for a value in excel? </p>
  
  <p>Or at least, if there existing such function, which returns in which cell (e.g. B2) such value exists?</p>