When creating a csv file using PHP for download in a browser, should I include the byte order mark bytes at the beginning to account for different target systems such as Mac, Unix, Windows, etc?
When creating a csv file using PHP for download in a browser, should I include the byte order mark bytes at the beginning to account for different target systems such as Mac, Unix, Windows, etc?
It is not mandatory to use the Byte Order Mark.
The Byte Order Mark is utilized in certain Unicode encodings like UTF-8, UTF-16, and UTF-32 to indicate that the encoding is indeed Unicode.
In UTF-16, it serves to distinguish UTF-16 from UCS-2 (which is a subset of UTF-16).
While the BOM is optional in UTF-8 and UTF-32, it is still considered valid. However, using it in UTF-8 may lead to compatibility issues. According to a detailed explanation provided in a Wikipedia article:
If maintaining compatibility with existing programs is not crucial, the BOM can be used to identify whether a file is in UTF-8 as opposed to a legacy encoding. Nevertheless, this approach can be problematic as the BOM may be added or removed without altering the actual encoding, or different encodings might be concatenated together. Checking the validity of UTF-8 text directly is a more dependable method than relying on the BOM.
Given these potential pitfalls, I would advise against using the BOM in UTF-8.
When considering the original inquiry, the encoding of the file plays a significant role. If the file is utf-8 encoded, including the BOM might be necessary. In cases where the file contains only ASCII characters, omitting the BOM is acceptable since there are no sequences present. However, if there are utf-8 sequences in the file, detecting the BOM can simplify the process compared to manually checking for valid sequences throughout the entire file. Furthermore, even identifying a single sequence may not guarantee that all characters are below 0x7F.
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