openssl_public_encrypt() encrypts data with public key and stores the result into crypted. Encrypted data can be decrypted via openssl_private_decrypt(). 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。
This function can be used e.g. to encrypt message which can be then read only by owner of the private key. It can be also used to store secure data in database.
See also openssl_private_decrypt() and openssl_private_encrypt().