Demos:
example-bigfile.php (source code)
example-colors.php (source code)
example-demo.php (source code)
example-merge2.php (source code)
example-panes.php (source code)
example-repeat.php (source code)
example-simple.php (source code)
example-stocks.php (source code)
example-textwrap.php (source code)

Class files:
class.writeexcel_biffwriter.inc.php
class.writeexcel_format.inc.php
class.writeexcel_formula.inc.php
class.writeexcel_olewriter.inc.php
class.writeexcel_workbookbig.inc.php
class.writeexcel_workbook.inc.php
class.writeexcel_worksheet.inc.php