How can I auto-detect ISO 8859-1 versus UTF-8 encoding in PHP? [duplicate]

This question already has answers here: Detect encoding and make everything UTF-8 (26 answers) Closed 11 months ago.

I have a legacy database table with a mixed encoding. Some lines are UTF-8 and some lines are ISO 8开发者_运维问答859-1.

Are there some heuristics I can apply on the content of a line to guess which encoding best represents the content?

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Convert from UTF-8. If that fails then it's not UTF-8, so you should probably convert from Latin-1 instead.

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Compare

iconv("UTF-8", "ISO-8859-1//IGNORE", $text)

and

iconv("UTF-8", "ISO-8859-1", $text)

If they are not equal - consider it UTF-8.