PHPExcel - Value from a Cell referencing to another Cell Did Not Obtained Properly

Question

I\'m having this problem when I tried to extract information from excel files. Here\'s my situation, I have 34 Excel files which I received from my various users.

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Answer 1

PHPExcel holds a calculation cache as well, and this is not cleared when you unset a workbook: it has to be cleared manually using:

PHPExcel_Calculation::flushInstance();

or

PHPExcel_Calculation::getInstance()->clearCalculationCache();

You can also disable calculation caching completely (although this may slow things down if you have a lot of formulae that reference cells containing other formulae) using:

PHPExcel_Calculation::getInstance()->setCalculationCacheEnabled(FALSE);

before you start processing your files

This is because currently PHPExcel uses a singleton for the calculation engine. It is in the roadmap to switch to using a multiton pattern later this year, which will effectively maintain a separate cache for each workbook, alleviating this problem.

EDIT

Note that simply unsetting $objPHPExcel does not work. You need to detach the worksheets before unsetting $objPHPExcel.

$objPHPExcel->disconnectWorksheets();
unset($objPHPExcel);

as described in section 4.3 of the Developer Documentation. And this is the point where you should also add the PHPExcel_Calculation::flushInstance();