you must set charset in first connect with mysql through this query:
SET CHARACTER SET utf8
for example in mysqli functions
$MySQL_Handle = mysqli_connect(HOSTNAME,DATABASE_USERNAME,DATABASE_PASSWORD,DATABASE_NAME) or die ( mysqli_error($MySQL_Handle) );
$sSQL= 'SET CHARACTER SET utf8';
mysqli_query($MySQL_Handle,$sSQL) or die ('Can\'t charset in DataBase');
this action need before insert and before select.