php Encode and decode html tags

i am using html_entity_decode($str) for decode html tags, but it cannot be able to decode the text. it show ? for " " in o开发者_如何学编程utput... i have used htmlentities also to encode it and at display time i decode it also. but the problem is not solve.you can watch the output at 'http://www.aspits.com/aspits/testimonials.php'. i am suffering from this please help me. i have tried so much things for it but i am not be able to get the solution for this. in database it appear correct means in database the entry is "test" but when i show it on front end then it display ?test? like this as output...

Do your character sets in database and HTML match?

If not, make them. Assuming you are using UTF-8.

<meta http-equiv="Content-Type" content=text/html; charset=utf-8" />

I'll also assume MySQL (please tag what database you are using).

SET NAMES 'utf-8'

Update

Just looked at your site. You are informing the browser you are using UTF-8.

Please check your database.