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fix: data loss for numeric value greater than excel supported max value #4523

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saifulferoz
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This is:

  • [ *] a bugfix

Checklist:

  • [*] Changes are covered by unit tests
    • [*] Changes are covered by existing unit tests
    • New unit tests have been added
  • [ *] Code style is respected
  • Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
  • CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
  • Documentation is updated as necessary

Why this change is needed?

This change is necessary because PHP_INT_MAX represents the maximum integer value supported by PHP on the current platform, which can be larger than what Excel or JavaScript can safely handle (specifically, numbers above 2^53 lose precision in JavaScript and Excel). By switching to self::EXCEL_MAX_INT (2^53), the code ensures that any integer value larger than what Excel can safely represent is treated as a string, preventing precision loss and data corruption when exporting to Excel. This makes the behavior consistent and safe across different platforms and environments.

Reference issue #4522

@oleibman
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I am not inclined to merge this. I see no reason why PhpSpreadsheet, which clearly has dependencies on Php and Excel, also needs a dependency on Javascript. However, I will have other suggestions to make in the linked issue.

@oleibman
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oleibman commented Jul 5, 2025

Superseded by PR #4527.

@oleibman oleibman closed this Jul 5, 2025
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2 participants