一个简单的加密和解密方法的PHP代码

<?php
class Encryption {
    private $key;

    public function __construct($key) {
        $this->key = $key;
    }

    public function encrypt($data) {
        $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
        $encrypted = openssl_encrypt($data, 'aes-256-cbc', $this->key, 0, $iv);
        return base64_encode($encrypted . '::' . $iv);
    }

    public function decrypt($data) {
        $data = base64_decode($data);
        list($encrypted_data, $iv) = explode('::', $data, 2);
        return openssl_decrypt($encrypted_data, 'aes-256-cbc', $this->key, 0, $iv);
    }
}

// 使用示例
$encryption = new Encryption('my_secret_key');
$encrypted_data = $encryption->encrypt('Hello World');
echo "加密后的数据：$encrypted_data\n";
$decrypted_data = $encryption->decrypt($encrypted_data);
echo "解密后的数据：$decrypted_data\n";
?>

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