How can you encrypt data in PHP?

The function openssl_encrypt() in PHP is used to encrypt data using a variety of encryption algorithms and modes provided by the OpenSSL library. This function supports AES, DES, Triple DES, and more, enabling developers to secure sensitive information by converting it into a format that cannot be easily understood without decryption.

To use openssl_encrypt(), you need to specify the plaintext input, the encryption method, the secret key, and optionally an initialization vector (IV) for certain encryption modes. This versatility and reliance on the well-established OpenSSL library make it a robust choice for data encryption in PHP applications.

The other options listed refer to functions that do not exist in the PHP standard library. Therefore, they cannot be used to encrypt data in PHP, highlighting the importance of correct function names and libraries when dealing with encryption.