//???????? textarea ?????????????????contact form7?
add_filter('wpcf7_validate_textarea', 'wpcf7_validation_textarea_hiragana', 10, 2);
add_filter('wpcf7_validate_textarea*', 'wpcf7_validation_textarea_hiragana', 10, 2);

function wpcf7_validation_textarea_hiragana($result, $tag)
{
    $name = $tag['name'];
    $value = (isset($_POST[$name])) ? (string) $_POST[$name] : '';

    if ($value !== '' && !preg_match('/[?-?]/u', $value)) {
        $result['valid'] = false;
        $result['reason'] = array($name => '??? / ?????????????');
    }

    return $result;
}<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/users/0/bellbet/web/veronica/wp-content/themes/MediaThemeRes/functions.php:228) in <b>/home/users/0/bellbet/web/veronica/wp-includes/pluggable.php</b> on line <b>1267</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/users/0/bellbet/web/veronica/wp-content/themes/MediaThemeRes/functions.php:228) in <b>/home/users/0/bellbet/web/veronica/wp-includes/pluggable.php</b> on line <b>1270</b><br />