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How to convert ASCII encoding to UTF8 in PHP
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If we know that the current encoding is ASCII, the 'iconv' function can be used to convert ASCII to UTF-8. The original string can be passed as a parameter to the iconv function to encode it to UTF-8.
Click Tools, then select Web options. Go to the Encoding tab. In the dropdown for Save this document as: choose Unicode (UTF-8). Click Ok.
ASCII is a subset of UTF-8, so all ASCII files are already UTF-8 encoded. The bytes in the ASCII file and the bytes that would result from "encoding it to UTF-8" would be exactly the same bytes. There's no difference between them, so there's no need to do anything.
ASCII is a subset of UTF-8, so if a document is ASCII then it is already UTF-8.
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If you know for sure that your current encoding is pure ASCII, then you don't have to do anything because ASCII is already a valid UTF-8.
But if you still want to convert, just to be sure that its UTF-8, then you can use iconv
$string = iconv('ASCII', 'UTF-8//IGNORE', $string); The IGNORE will discard any invalid characters just in case some were not valid ASCII.
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