how many sheets in a XLS file?

```
I don't find a way to get the number of sheets in a XLS file accroding to the
excel-reader api,but there is a simple way to finish it.

we can use the function rowcount($sheet=0) to finish it.

The code just like the follow,and it works well.Put it in the Class
Spreadsheet_Excel_Reader.
//////////////////Code here

function countSheets()
{
$i = 0;
while(1)
{
if($this->rowcount($i) > 0)
{
$i++;
}
else
{
break;
}
}
return $i;
}

```

Original issue reported on code.google.com by `xiaoLin3...@gmail.com` on 17 Oct 2010 at 5:50

Start in the Spreadsheet_Excel_Reader class and inspect how rowcount($sheet=0) behaves for valid and invalid sheet indexes. Add a countSheets entry point that reports the number of available sheets, then verify it against XLS files with multiple sheets and an empty or missing next index.

Written by the indexing model from the issue text.