title: PHPExcel getHighestColumn() not working
body: <p>Rather than defining cell color etc. in a range in the form of "A1:G1" or range('A','G') - since the table is dynamic and will have different count of columns each time - I wanted to use the range in the form of:</p>
  
  <pre><code>-&gt;getStyle('A1:' . $highestColumn . '1')
  </code></pre>
  
  <p>where</p>
  
  <pre><code> $highestColumn = $objPHPExcel-&gt;getActiveSheet()-&gt;getHighestColumn();
  </code></pre>
  
  <p>but this is not working. If I print the result, $highestColumn is shown to be "A", whereas in fact it should be "G".</p>
  
  <p>Why is getHighestColumn() not working?</p>