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openssl_private_decrypt() decrypts data that was previous encrypted via openssl_public_encrypt() and stores the result into decrypted. key must be the private key corresponding that was used to encrypt the data. padding defaults to OPENSSL_PKCS1_PADDING, but can also be one of OPENSSL_SSLV23_PADDING, OPENSSL_PKCS1_OAEP_PADDING, OPENSSL_NO_PADDING.
如果成功则返回 TRUE，失败则返回 FALSE。
You can use this function e.g. to decrypt data which were supposed only to you.
See also openssl_public_encrypt() and openssl_public_decrypt().