Why am I seeing strange characters in my opencart and wordpress sites?

I just moved from development to deployment environment and am having strange problems. The site is comprised of two parts opencart (http://www.missionfamily.org) and wordpress (http://www.missionfamily.org/content)

Everything works fine except that the special characters such as accented letters (in wordpress) and all quite a lot of icon/symbol fonts in opencart are being rendered as strange characters or placeholder icons.

In wordpress my settings are as such:
/** MySQL hostname */
define('DB_HOST', 'localhost');
/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

I am on a Centos 7 cPanel and the demo site was also here till a few hours ago, and everything was working just fine there. What could be the problem? It is driving me nuts.

thanks in advance
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badwolfffAuthor Commented:
By the way what I mean by special chars is (in opencart) where it should show the euro symbol, I get 0.00€ (0)

and in wordpress I get things like: “People4Soil”
Ray PaseurCommented:
This is a character-set collision.  It's becoming more frequent now that PHP is changing its posture on character sets to embrace UTF-8.  I originally published an article here at E-E, but it was impossible to get it formatted correctly, so I moved the article to my own web site.  Link here:

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