How Can I Fix UTF-8 Encoding Issues When Exporting CSV Files in PHP?

Encoding Problems with CSV Output in PHP

Many applications struggle to interpret CSV files encoded in UTF-8 correctly, including Microsoft Excel. Despite setting the appropriate HTTP headers, Excel specifically fails to recognize UTF-8 encoding.

To resolve this issue, one approach is to include the BOM (Byte Order Mark) at the beginning of the CSV output. The BOM identifies the file as UTF-8 encoded, which Excel can then interpret correctly.

To add the BOM to a CSV file in PHP, use the following code:

header('Content-type: text/csv; charset=UTF-8');
header('Content-Disposition: attachment; filename=Customers_Export.csv');
echo "\xEF\xBB\xBF"; // UTF-8 BOM

This method has been reported to work in Excel 2007 for Windows. However, it is unclear whether it will be successful on Mac operating systems.

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