PHPExcel developer documentation
getCalculatedValue() problem using IF formula with PHPExcel | Just a Day in the Office
Accessing cells - PhpSpreadsheet Documentation
Reuse Excel business logic with PHPExcel - Maarten Balliauw {blog}
php - Excel Total Hours Calculation using PHPExcel in HH:MM format with HH greater than 24 hours - Stack Overflow
2016
php - Read Excel's internal calculated values with PHPExcel - Stack Overflow
Calculation Engine - PhpSpreadsheet Documentation
PHP | Spreadsheet | Setting a date and/or time value in a cell - GeeksforGeeks
Calculation Engine - PhpSpreadsheet Documentation
php - Date calculation with PHPExcel library - Stack Overflow
PHPExcel developer documentation — phpexcel_library 1.7.4 documentation
PHPExcel developer documentation
ILIAS: PHPExcel_Calculation Class Reference
2016
How to Create/Read EXCEL files in PHP - IOmundo
Generate Excel Files and Charts with PHPExcel - SitePoint
php - Reading values from specific range of cells using phpexcel - Stack Overflow
Reuse Excel business logic with PHPExcel - Maarten Balliauw {blog}
ILIAS: PHPExcel_Calculation Class Reference
Replace Excel errors using this function - Journal of Accountancy
phpexcel/Calculation.php at master · hoaquynhtim99/phpexcel · GitHub
phpexcel - Sum calculation of excel column - PHP Excel - Stack Overflow
php - calculating sum with PHPExcel - Stack Overflow
PHPExcel/Calculation.php at 1.8 · PHPOffice/PHPExcel · GitHub
