问题
My page often shows things like ë, Ã, ì, ù, à in place of normal characters.
I use utf8 for header page and MySQL encode. How does this happen?
回答1:
These are utf-8 encoded characters. Use utf8_decode() to convert them to normal ISO-8859-1 characters.
回答2:
If you see those characters you probably just didn’t specify the character encoding properly. Because those characters are the result when an UTF-8 multi-byte string is interpreted with a single-byte encoding like ISO 8859-1 or Windows-1252.
In this case ë could be encoded with 0xC3 0xAB that represents the Unicode character ë (U+00EB) in UTF-8.
回答3:
Even though utf8_decode is a useful solution, I prefer to correct the encoding errors on the table itself. In my opinion it is better to correct the bad characters themselves than making "hacks" in the code. Simply do a replace on the field on the table. To correct the bad encoded characters from OP :
update <table> set <field> = replace(<field>, "ë", "ë")
update <table> set <field> = replace(<field>, "Ã", "à")
update <table> set <field> = replace(<field>, "ì", "ì")
update <table> set <field> = replace(<field>, "ù", "ù")
Where <table> is the name of the mysql table and <field> is the name of the column in the table. Here is a very good check-list for those typically bad encoded windows-1252 to utf-8 characters -> Debugging Chart Mapping Windows-1252 Characters to UTF-8 Bytes to Latin-1 Characters.
Remember to backup your table before trying to replace any characters with SQL!
[I know this is an answer to a very old question, but was facing the issue once again. Some old windows machine didnt encoded the text correct before inserting it to the utf8_general_ci collated table.]
来源：https://stackoverflow.com/questions/5127744/how-to-convert-these-strange-characters-%c3%83-%c3%83-%c3%83%c2%ac-%c3%83%c2%b9-%c3%83