private function _writeExterncount($cxals)
	{
		$record   = 0x0016;          // Record identifier
		$length   = 0x0002;          // Number of bytes to follow

		$header   = pack("vv", $record, $length);
		$data     = pack("v",  $cxals);
		$this->_append($header . $data);
	}
private function _writeExterncount($cxals)
	{
		$record   = 0x0016;          // Record identifier
		$length   = 0x0002;          // Number of bytes to follow

		$header   = pack("vv", $record, $length);
		$data     = pack("v",  $cxals);
		$this->_append($header . $data);
	}
private function _writeExterncount ( $ cxals ) { $ record = 0x0016 ; // Record identifier $ length = 0x0002 ; // Number of bytes to follow $ header = pack ( "vv" , $ record , $ length ) ; $ data = pack ( "v" , $ cxals ) ; $ this -> _append ( $ header . $ data ) ; }
Write BIFF record EXTERNCOUNT to indicate the number of external sheet
references in the workbook.

Excel only stores references to external sheets that are used in NAME.
The workbook NAME record is required to define the print area and the repeat
rows and columns.

A similar method is used in Worksheet.php for a slightly different purpose.

@param integer $cxals Number of external references
Write BIFF record EXTERNCOUNT to indicate the number of external sheet references in the workbook .