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5d6687b6ce
ISTEXT should always return FALSE for empty cells, however PHPExcel returns TRUE if the cell is formatted. This can be reproduced in Excel by choosing formatting category "Text" for cell A1, and then in cell B1 input the formula '=ISTEXT(A1)'. B1 will display FALSE, but PHPExcel will return TRUE. This patch fix the NULL value being incorrectly cast to an empty string, and thus eliminating ISTEXT() issue (and probably several others).
PHPExcel - OpenXML - Read, Write and Create spreadsheet documents in PHP - Spreadsheet engine
PHPExcel is a library written in pure PHP and providing a set of classes that allow you to write to and read from different spreadsheet file formats, like Excel (BIFF) .xls, Excel 2007 (OfficeOpenXML) .xlsx, CSV, Libre/OpenOffice Calc .ods, Gnumeric, PDF, HTML, ... This project is built around Microsoft's OpenXML standard and PHP.
Master: 
Develop: 
File Formats supported
Reading
- BIFF 5-8 (.xls) Excel 95 and above
- Office Open XML (.xlsx) Excel 2007 and above
- SpreadsheetML (.xml) Excel 2003
- Open Document Format/OASIS (.ods)
- Gnumeric
- HTML
- SYLK
- CSV
Writing
- BIFF 8 (.xls) Excel 95 and above
- Office Open XML (.xlsx) Excel 2007 and above
- HTML
- CSV
- PDF (using either the tcPDF, DomPDF or mPDF libraries, which need to be installed separately)
Requirements
- PHP version 5.2.0 or higher
- PHP extension php_zip enabled (required if you need PHPExcel to handle .xlsx .ods or .gnumeric files)
- PHP extension php_xml enabled
- PHP extension php_gd2 enabled (optional, but required for exact column width autocalculation)
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License
PHPExcel is licensed under LGPL (GNU LESSER GENERAL PUBLIC LICENSE)