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An AES encryption implementation in PHP with OpenSSL module.
// Set cipher method
$cipherMethod = 'AES-256-CBC';
// Set encryption key
// The key length must be 256 bits long
$key = (empty($key)) ? openssl_random_pseudo_bytes(32) : '...';
// Set initialization vector
$iv = (empty($iv)) ? openssl_random_pseudo_bytes(openssl_cipher_iv_length($cipherMethod)) : '...';
// Encryption
// openssl_encrypt uses PKCS#7 padding by default if the options parameter was set to zero
$encryptedString = openssl_encrypt($rawString, $cipherMethod, $key, 0, $iv);
// Decryption
$decryptedString = openssl_decrypt($encryptedString, $cipherMethod, $key, 0, $iv);
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