Encrypt & Decrypt data using AES algorithm

ØEncryption:

function encrypt($action, $string) {

    $output = false;

 $encrypt_method = "AES-256-CBC";

    $secret_key = 'This is my secret key';

    $secret_iv = 'This is my secret iv';

 // hash

    $key = hash('sha256', $secret_key);

// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning

    $iv = substr(hash('sha256', $secret_iv), 0, 16);

    $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);

    $output = base64_encode($output);

   return $output;

}

$plain_txt = "This is my plain text";

echo "Plain Text =" .$plain_txt;

$encrypted_txt = encrypt('encrypt', $plain_txt);

echo "Encrypted Text =". $encrypted_txt;

ØDecryption:

function decrypt($action, $string) {

    $output = false;

$encrypt_method = "AES-256-CBC";

    $secret_key = 'This is my secret key';

    $secret_iv = 'This is my secret iv';

 // hash

    $key = hash('sha256', $secret_key);

   // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning

    $iv = substr(hash('sha256', $secret_iv), 0, 16);

    $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);

    return $output;

}

$plain_txt = "This is my plain text";

echo "Plain Text =" .$plain_txt;

$decrypted_txt = decrypt('decrypt', $encrypted_txt);

echo "Decrypted Text = $decrypted_txt\n";