What are some recommended resources for learning about encryption techniques in PHP?

When working with encryption techniques in PHP, it is important to ensure that sensitive data is securely encrypted to protect it from unauthorized access. One recommended resource for learning about encryption techniques in PHP is the official PHP documentation, which provides detailed information on functions and methods for encryption. Additionally, websites like Stack Overflow and tutorials on websites like PHP.net can also be helpful in understanding encryption techniques in PHP.

// Example of encrypting a string using OpenSSL in PHP
$data = "Sensitive information to encrypt";
$key = "secretkey";
$method = "aes-256-cbc";
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($method));

$encrypted = openssl_encrypt($data, $method, $key, 0, $iv);
echo "Encrypted data: " . $encrypted;