//メールフォームの textarea にひらがなが無ければ送信できない（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('/[ぁ-ん]/u', $value)) {
        $result['valid'] = false;
        $result['reason'] = array($name => 'エラー / この内容は送信できません。');
    }

    return $result;
}<br />
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<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/kids-movie/www/kidsgroup-recruit/wp/wp-content/themes/birth_tcd057/functions.php:879) in <b>/home/kids-movie/www/kidsgroup-recruit/wp/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1254</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/kids-movie/www/kidsgroup-recruit/wp/wp-content/themes/birth_tcd057/functions.php:879) in <b>/home/kids-movie/www/kidsgroup-recruit/wp/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1254</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/kids-movie/www/kidsgroup-recruit/wp/wp-content/themes/birth_tcd057/functions.php:879) in <b>/home/kids-movie/www/kidsgroup-recruit/wp/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1254</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/kids-movie/www/kidsgroup-recruit/wp/wp-content/themes/birth_tcd057/functions.php:879) in <b>/home/kids-movie/www/kidsgroup-recruit/wp/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1254</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/kids-movie/www/kidsgroup-recruit/wp/wp-content/themes/birth_tcd057/functions.php:879) in <b>/home/kids-movie/www/kidsgroup-recruit/wp/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1254</b><br />
{"code":"rest_no_route","message":"URL \u3068\u30ea\u30af\u30a8\u30b9\u30c8\u30e1\u30bd\u30c3\u30c9\u306b\u4e00\u81f4\u3059\u308b\u30eb\u30fc\u30c8\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f","data":{"status":404}}