Remove ÿþ from string

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ÿþ is 0xfffe in UTF-8; this is the byte order mark in UTF-16.
You can convert your string to UTF-8 with iconv or mb_convert_encoding():

$trackartist1 = iconv('UTF-16LE', 'UTF-8', $trackartist1);

# Same as above, but different extension
$trackartist1 = mb_convert_encoding($trackartist1, 'UTF-16LE', 'UTF-8');

# str_replace() should now work
$trackartist1 = str_replace('ÿþ', '', $trackartist1);

This assumes $trackartist1 is always in UTF-16LE; check the documentation of your ID3 tag library on how to get the encoding of the tags, since this may be different for different files. You usually want to convert everything to UTF-8, since this is what PHP uses by default.

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