A legelejére:
header('Content-Type: text/html; charset=UTF-8');
A mysql csatlakozás mögé pedig
$conn->query("SET character_set_results = 'utf8', character_set_client = 'utf8', character_set_connection = 'utf8', character_set_database = 'utf8', character_set_server = 'utf8'");
#define true (rand() > 10)