title: getHighestColumn in xlsx not working
body: <p>Have this code, using PHPExcel</p>
  
  <pre><code>    public function getHighestColumn()
      {
        return $this-&gt;objPHPExcel-&gt;setActiveSheetIndex(0)-&gt;getHighestColumn();
      }
  
      public function getHighestRow()
      {
        return $this-&gt;objPHPExcel-&gt;setActiveSheetIndex(0)-&gt;getHighestRow();
      }
  </code></pre>
  
  <p>I have the same excel file saved in .xls and .xlsx
  It has 10 columns (From B to K), and 10 rows</p>
  
  <p>When I use <code>getHighestColumn</code>, in .xls I'm getting 'K' (correct), but in .xlsx I'm getting AMK (the last column in all excel worksheet)
  About the row, using .xls I'm getting 10, but in .xlsx I'm getting 1024.
  I'm pretty sure that, except the table, the rest of the worksheet is in blank.</p>
  
  <p>Any ideas why I'm getting different result?</p>
  
  <p>Here are the readers I'm using</p>
  
  <pre><code>public function openReader($filePath)
      {
        //aca determinamos cual tipo es para saber que reader es
      $reader_5 = new PHPExcel_Reader_Excel5();
      $reader_07 = new PHPExcel_Reader_Excel2007();
  
      $inputFileType = $this-&gt;canRead(new PHPExcel_Reader_Excel5(), $filePath, self::EXCEL5);
  
      if($inputFileType === '')
        $inputFileType = $this-&gt;canRead(new PHPExcel_Reader_Excel2007(), $filePath, self::EXCEL2007);
      else
      {
        throw new Exception("No se puede procesar el archivo; el formato no es correcto");
      }
      return PHPExcel_IOFactory::createReader($inputFileType);
      }
  
  
  private function canRead($reader, $path, $readerType)
    {
      return $reader-&gt;canRead($path) ? $readerType: '';
    }
  
  public function persist($fileName)
      {
        $filePath = sfConfig::get('sf_upload_dir').'\\'.$fileName;
  
        $this-&gt;objReader = $this-&gt;openReader($filePath);
        //Set only first Sheet
        $this-&gt;setOnlyFirstSheet();
  
        $this-&gt;createObjPHPExcel($filePath);
  
        echo $this-&gt;getHighestColumn();
        echo $this-&gt;getHighestRow();
       }
  </code></pre>
  
  <p>I've checked with <code>var_dump</code> and in each case I'm using the right reader.</p>
  
  <p>php 5.3.5, PHPExcel 1.7.8, Symfony 1.4</p>