How to utilize encryption and decryption functions in PHP?

PHP has many encryption and decryption functions available. The most commonly used encryption and decryption functions are base64_encode() and base64_decode(), which can convert data into Base64 encoding format and decode it.

Here is an example showing how to use the functions base64_encode() and base64_decode() for encryption and decryption:

$data = "Hello World!"; // 要加密的数据

// 加密
$encryptedData = base64_encode($data);
echo "加密后的数据：" . $encryptedData . "\n";

// 解密
$decryptedData = base64_decode($encryptedData);
echo "解密后的数据：" . $decryptedData;

When you run the above code, the output will be as follows:

加密后的数据：SGVsbG8gV29ybGQh
解密后的数据：Hello World!

Other than base64_encode() and base64_decode(), PHP also offers other encryption and decryption functions such as md5(), sha1(), and crypt(), so you can choose the appropriate function based on your specific needs for encryption and decryption operations.