The Cost of Failing Closed: What Shipped Across Nine PHP Extensions

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Making ExcelBook::save() atomic is easy to describe. Write the workbook to a temporary file, then rename it into place. A save that dies halfway leaves the original file untouched. The obvious way to build that staged file is to ask LibXL for the finished archive as one buffer and write the buffer out. It works. It also costs 67.7 MB of peak RSS on a 3.3 MB workbook, and the PHP-side copy counts…

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