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PHPで文字列に含まれている日本語(ひらがな、カタカナ、漢字)の文字数を取得

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バリデーションなどで日本語の文字数をチェックするのに利用出来るかと思います。

$count = preg_match_all('/[ぁ-んァ-ヶー一-龠]/u', $text);
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