$exists = $objPHPExcel->sheetNameExists('Worksheet 1');
/**
* Check if a sheet with a specified name already exists
*
* @param string $pSheetName Name of the worksheet to check
* @return boolean
*/
$exists = $objPHPExcel->sheetNameExists('Worksheet 1');
/**
* Check if a sheet with a specified name already exists
*
* @param string $pSheetName Name of the worksheet to check
* @return boolean
*/