问题
For some reason i get a £76756687 weird character when i type a £ into a text field on my form?
回答1:
As you suspect, it's a character encoding issue - is the page set to use a charset of UTF-8? (You can't go wrong with this encoding really.) Also, you'll probably want to entity encode the pound symbol on the way out (£)
As an example character set (for both the form page and HTML email) you could use:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
That said, is there a good reason for the user to have to enter the currency symbol? Would it be a better idea to have it as either a static text item or a drop down to the left of the text field? (Feel free to ignore if I'm talking arse and you're using a freeform textarea or summat.)
回答2:
You’re probably using UTF-8 as character encoding but don’t declare your output correctly. Because the £ character (U+00A3) is encoded in UTF-8 with 0xC2A3. And that byte sequence represents the two characters  and £ when interpreted with ISO 8859-1.
So you just need to specify your character encoding correctly. In PHP you can use the header function to set the proper value for Content-Type header field like:
header('Content-Type: text/html;charset=utf-8');
But make sure that you call this function before any output. Otherwise the HTTP header is already sent and you cannot modify it.
来源：https://stackoverflow.com/questions/2066693/php-strange-character-before-%c2%a3-sign