Are apache environment variables ASCII (as reflected in PHP $_SERVER)? -


i'm sanitizing user_agent logging in php , need know whether use substr() or mb_strcut().

seeing how user_agent directly derived http request header user-agent, i'm going assume you're interested in http headers.

is possible http headers contain bytes outside 7-bit ascii range? yes.

is you'll see in practice , need handle properly? i'd no.

therefore suggest third option: first strip non-ascii characters string, use regular multibyte-unsafe functions heart's content.


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