PHP MySQL Greek letters showing like ???? marks

Try this:

mysqli_set_charset($con, "utf8");

After you connect to DB.

try the following:

after you connect to the mysql, do this query to make sure that you are using UTF8:

mysql_query("SET NAMES 'utf8'");
mysql_query("SET CHARACTER SET 'utf8'");

make sure that in HTML (head) you are using the right encoding, try:

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

if this does not help, try different encoding, like ISO-8859-1

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