[php] Convert utf8-characters to iso-88591 and back in PHP

First of all, don't use different encodings. It leads to a mess, and UTF-8 is definitely the one you should be using everywhere.

Chances are your input is not ISO-8859-1, but something else (ISO-8859-15, Windows-1252). To convert from those, use iconv or mb_convert_encoding.

Nevertheless, utf8_encode and utf8_decode should work for ISO-8859-1. It would be nice if you could post a link to a file or a uuencoded or base64 example string for which the conversion fails or yields unexpected results.

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