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json_decodeの返り値がnullになったときの対処

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jsonを暗号化してCookieに保管し、必要なときに復号化してデータ取り出しをやっていたのですが、json_decodeの返り値がnullになるという問題が発生しました。

データを取り出した際にBOMがついてしまっていたのが原因だったので、

json_decode(preg_replace('/[\x00-\x1F\x80-\xFF]/', '', $data),true);  

のようにBOMを落としてあげると、無事json_decodeが通りました。

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