Implement ExcelSheet::writeFormula() and ExcelSheet::setTabRgbColor() #30
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ExcelSheet::writeFormula()This enables creation of formula with arbitrary precalculated value to make preview and others show content instead of a "blank cell".
This effectively shall drop limitation in the README (https://github.com/doPhp/excel?tab=readme-ov-file#formulas-written-but-no-values-readable) that suggests to open file in Excel via COM and save back.
Implementation of the C methods:
xlSheetWriteFormulaNumxlSheetWriteFormulaStrxlSheetWriteFormulaBoolExcelSheet::setTabRgbColor()Similarly to the existing method
ExcelSheet::setTabColor(), this allows an arbitrary RGB color to be used for a sheet.Implementation of the C method:
xlSheetSetTabRgbColorMisc
ExcelSheet::readComment()andExcelSheet::writeComment()only work for .xls files (not .xlsx). This is stated in the LibXL documentation but wasn't specified explicitly in the PHP documentation