2016
PHP | Spreadsheet | Setting a date and/or time value in a cell - GeeksforGeeks
How to Create/Read EXCEL files in PHP - IOmundo
Replace Excel errors using this function - Journal of Accountancy
php - How to automatically read in calculated values with PHPExcel? - Stack Overflow
PHPExcel developer documentation — phpexcel_library 1.7.4 documentation
php - calculating sum with PHPExcel - Stack Overflow
Reuse Excel business logic with PHPExcel - Maarten Balliauw {blog}
How to Sum Diagonal Cells in a range in Excel? - GeeksforGeeks
How to Create/Read EXCEL files in PHP - IOmundo
Generate Excel Files and Charts with PHPExcel - SitePoint
Reuse Excel business logic with PHPExcel - Maarten Balliauw {blog}
php - Date calculation with PHPExcel library - Stack Overflow
Calculation Engine - PhpSpreadsheet Documentation
Accessing cells - PhpSpreadsheet Documentation
ILIAS: PHPExcel_Calculation Class Reference
PHPExcel developer documentation
2016
PHPExcel/Calculation.php at 1.8 · PHPOffice/PHPExcel · GitHub
2016
php - Excel Total Hours Calculation using PHPExcel in HH:MM format with HH greater than 24 hours - Stack Overflow
