For global purposes.
Instead of converting, codifying, decodifying each text I prefer to let them as they are and instead change the server php settings. So,
Let the diamonds
From the browser, on the view menu select "text encoding" and find the one which let's you see your text correctly.
Edit your php.ini and add:
default_charset = "ISO-8859-1"
or instead of ISO-8859 the one which fits your text encoding.