Best way to encode?

[Brian Dunning <brian@xxxxxxxxxxxxxxxx>]

I have a form where people input some text, which is then incorporated 
into an HTML snippet which appears in a textarea for them to copy & 
paste into a web page.

People will be entering foreign language stuff as well as special 
characters like copyright, so I have to be sure this is handled 
properly.

I tried rawurlencode() but that results in HTML which displays the 
encoding when they paste it into their web page. I tried htmlentities 
but that gives different characters than what they typed when displayed 
in the textarea. I also tried no encoding, which worked well, except 
that it gets messed up when I try to write it to the database and I 
have the same problem again when retrieving it.

"Cañon ©" is a good example.
htmlentities('Cañon ©') -> Cañon © in the textarea, displays on their 
web page as Cañon ©, but reads/writes OK from the database.
rawurlencode('Cañon ©') -> Ca%C3%B1on%20%C2%A9 in the textarea, 
displays on their web page as Ca%C3%B1on%20%C2%A9, but reads/writes OK 
from the database.
No encoding gives Cañon © in the textarea and displays on their web 
page as Cañon ©, but appears in the database as Cañon ©

How can I handle this so that what ultimately displays on their web 
page, after copying the HTML out of the textarea, matches what they 
typed in the form, and yet can be read & written from the database 
properly?

- Brian

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