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<?php $token = "abcdefABCDEF1234567890"; var_dump(base64_encode($token)); var_dump(base64_encode(strtolower($token))); var_dump(base64_encode(strtoupper($token))); var_dump(hex2bin(base64_encode($token))); var_dump(hex2bin(base64_encode(strtolower($token)))); var_dump(hex2bin(base64_encode(strtoupper($token))));

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