openssl_public_encrypt

The openssl_public_encrypt() function is a PHP function that uses the OpenSSL library to encrypt data using a public key. This function takes three parameters: the data to be encrypted, the public key, and a variable to store the encrypted data. The function returns a Boolean value indicating whether the encryption was successful or not.

The public key used in this function is typically obtained from the recipient of the encrypted data, as it is the key that can be used to decrypt the data. The private key, on the other hand, is kept secret by the recipient and is used to decrypt the data.

The openssl_public_encrypt() function is commonly used in web applications to transmit sensitive data securely over the internet. For example, a user's credit card information can be encrypted using the merchant's public key before being transmitted to the merchant's server for processing