garbled when inserted into mysql

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<?php
mb_language('ja');
mb_internal_encoding('UTF-8');
mb_regex_encoding('UTF-8');
header('Content-Type:text/html; charset=UTF-8');   
    try{
        $dbh = new PDO (DSN, DB_USER, DB_PASSWORD);
        $stmt = $dbh->query("SET NAMES utf8;");
    } catch(PDOException$e){
        echo$e->getMessage();
        exit;
    }